Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4bcf7a71c2d261…

MALICIOUS

PDF

87.0 KB Created: 2021-10-11 05:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d754c54b3c9dcb669aa96af1eabe5ff0 SHA-1: aa2ea4e32fcff404c5b2b35cbec854076d415833 SHA-256: ba4bcf7a71c2d26144541997393834108df594bbf8a196841da034cfb3f5847c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 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.
  • 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://deltools.com/userfiles/file/93249706165.pdf In PDF document text
    • https://alhasooncorp.com/Files/files/mulowigogemuden.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/paterasutifa.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/87049751030.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/46950768132.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1720e257aff0cb2aa0f5ea47861692c2/pigebizirajorajozibofu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/50457860134.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4kigilemqd3om8f3utjqocv363/82551744918.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/mivelixujegovobagok.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/22144478155.pdfIn PDF document text
    • http://htygroup.com/upload/files/85903477525.pdfIn PDF document text
    • https://verner.lt/images/files/jonis.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdabc05e68---64011715886.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/36548398403.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/16490629327.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/jomekon.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/vugaranus.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021981228545562.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109191618383929.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/wuwejokezukumomafeja.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395d6e3c3bd---lifurona.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/labafofikebop.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6df4a6f30---20957173443.pdfIn PDF document text
    • https://shinaltd.ru/images/file/31069625493.pdfIn PDF document text
    • http://biosite.ru/images/news/file/gidexup.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/desop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=active+galactic+nuclei+pdfPDF 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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 10556 bytes
SHA-256: 219cc30de5c08ad1935233efe6bacc53ae0486111238ad9e22af58d40ca15c8d
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 18996 bytes
SHA-256: 3d8fec28d070c5def6b6ab12919da1a7ffa1996919b676373d99643ecf2216be
font_02_sfnt_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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