Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f03b6532c7efb3…

MALICIOUS

PDF

86.7 KB Created: 2021-07-15 12:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dbcb832b56d9d3b77b1b2160aec1dc1 SHA-1: 13895a96569bb8cebcb98ff43dc72b1b2e48815d SHA-256: 03f03b6532c7efb32617c383acdc32456590556135d6652e9b81e53a0511d266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress sites, suggesting it's designed to lead users to malicious content or downloads. The presence of multiple external URIs and a link farm structure points towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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 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 https://drafthe.ru/uplcv?utm_term=pet+names+for+guy+best+friend
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160807313a25e7---85008717956.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c284d2b3---bijukajowos.pdf
    • http://megalabsrl.it/userfiles/files/85545181918.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b06d2e887---91859949392.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7536953e0---5544082527.pdf
    • http://dobre-jaja.com/Upload/file/87265177263.pdf
    • http://daiichihr.com/uploads/news_file/12113900255.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc40618833---sarobodakilatajalubigi.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202105280003378968.pdf
    • https://foodvellythailand.com/upload/files/98441164167.pdf
    • http://brixtontaxi.com/survey/userfiles/files/26675124632.pdf
    • https://12tiga.com/contents//files/90958725305.pdf
    • https://arvikabc.com/images/uploadedimages/file/11244419058.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rfmvr0chjbs7bit53iia6sil56/dafuvizuv.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/3992675412.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/216331dd1e587908b8905e280f3d5155/vapoxu.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5b82c02157562f21f7489500cc06bddc/17956461881.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a08713478a9b0a41c32cddddcc97bc14/tuvevaduvazukeke.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/c8201f337bb364d33ec5a6d8f070b8b2/serup.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/89077173858.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xofavidijugeroj.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0f7f0f4905f336387d14fa4cca10d567/ferevedevanuwevutoxovobup.pdf
    • http://pivotal-technologies.com/userfiles/file/72461187881.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/97947551958.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609466416c37b---piremuponitimewotefujo.pdf
    • https://camelcarpet.org/d/files/72647674190.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07f.bin
df8860dc07fd5d1d03d66f91a8137749ba404704f9486938555c6eef167bcb2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 16828 bytes
font_01_sfnt_off00011bd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16792 bytes
font_02_sfnt_off000133e7.bin
8c5dfa1e3fa8bf03c2d0d74f6b2d8d6d113c0aa84d8b1f5107dd29fbf4305a80
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 11008 bytes