Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34499d4649fa778…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 13:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9046bd8942baaff0acdfd6d8778bec2e SHA-1: 99092c3d16e4b6c50f42831b5f87d88e51556a1a SHA-256: f34499d4649fa7789ad5dc720fb80af430f2afe3a929613ef63d899a71939849
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a266635b---22010500178.pdf In PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/tedumupa.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xirixilorejeve.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/rogugisorifizitarigasi.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/sujipajekotare.pdfIn PDF document text
    • http://airfa.it/userfiles/file/51525480874.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/sazan.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/39260355667.pdfIn PDF document text
    • http://forti.in/userfiles/file/pudajikudisonazesuxoxom.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/bodipanefaxuwime.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zukibiso.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/90117432840.pdfIn PDF document text
    • http://bluebossa.pl/files/file/72165202357.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bategexoralimisubavo.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210911_78E94FBC83033281.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/39730682466.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4c2b8bff3ad4c05ae1dfeb1623b31a0d/nixuxivesive.pdfIn PDF document text
    • https://istanajp.com/contents/files/87459724013.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135a624cf89a---9296039862.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/88297126917.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/81922737694.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04f890cf2c64584c0fd7e4a40fcf1da6/82214958523.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910004658.pdfIn PDF document text
    • http://pinxedien.net/upload/files/sojofodi.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/61410911753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shadow+fight+2+max+level+99+apkPDF 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_off0000c4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 17600 bytes
SHA-256: b347c8557edef91d422b912cec829c832a82c5ad9b1a1b5fdb4bc89617ccd264
font_02_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 11280 bytes
SHA-256: 730589a8d3a4ab9c30f2f71caff7360715cf08c1687e45e2654abb390d920c35

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