Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fc481ff37241c0…

MALICIOUS

PDF

83.6 KB Created: 2021-08-24 16:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a1f05a7ae8166f52926057297233b5b SHA-1: 9874e3826e5fb76660bb2c7475bbc577a5a3358d SHA-256: 59fc481ff37241c04d142725f728e21c1bd8b539d1b8cb7719ae69efebd63f5b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a payload. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0b9ef465d7d7575b2d1b41cbdff4fec7/livexobinuzutu.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c411151b---83697885287.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/wetenipanuwu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607065b4455d8---wuriwaxadujowotovusigubim.pdfIn PDF document text
    • http://resicolor.com/upload/files/30434406675.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e355qbghbbuhcf22dapno2nmq0/101358394.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/05cukhalpj6ip5uusu0als83at/likozajoxumasovamapudaba.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc8502236d---winupoxevilig.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccafc4fa72---nifuzuji.pdfIn PDF document text
    • http://tai-group.com/upload/files/60026705011.pdfIn PDF document text
    • https://abeess.com/userfiles/file/duzegilak.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/05/file/35132332923.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/gileraja.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/dd9dc50a9cb0ff4a2bd7069d9be8ecb9/zesatabimomevotorulib.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fd200355b75ed8f7b12b4dff4cc2f5b7/91950767139.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebcf7a5431---fugufijufu.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/37120279907.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77aca030e---68553600346.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/ludaxiri.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wolikutoni.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/logobibefimozogegasi.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4k93ic8ft9c6ilm0gk6a55snj5/liliwugufifexeronoj.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/xivibedejofiterubabur.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lumemusudibagajerejowo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/7551334814.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/35245401918.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/85624694729.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/86991428622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nmms+exam+question+paper+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10936 bytes
SHA-256: e70160a08a79c7ff8c47a84fb77f066de709d76a893acf9fc19e134d69fd562b
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 17072 bytes
SHA-256: c240bde29665de89dfedc83e49a59be59f4dcd44ed0ce1b7dff8d323bbd5972e

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