Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa48e28db6b6fdc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 08:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21acf7c6a2971c90a151437e621a0dc5 SHA-1: 10d337b4b0170ae2ae449a640b8ed0b45dce3861 SHA-256: 9aa48e28db6b6fdca938be8b4a09ed2c6475d26f18833572bb8a7c875ed7d7a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the overall structure and URL patterns suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=compartir+wifi+desde+android+a+pc PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d557e1547172ca15c4b1fc1d7818ebbe/dugezizozejero.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/99930959660.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/32221976265.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4a9ff312808b12ce15c2f908e0a913c9/42921729677.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/xixakevibotadajerijipi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/naxobimuvajube.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/68847909967.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/47229657445.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/wulevikipezu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210908124513.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/27760744170.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/10232797091.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/83686723351.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/57198666887.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/nusus.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3cba79a51a77d2199449366e48403c84/gugobizodezinadosodavotim.pdfIn PDF document text
    • http://healthywithhart.com/res/file/pefuxagetoxababibusanox.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50064979719.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/26854055574.pdfIn PDF document text
    • https://kiptep.ru/file/pemogogafofinujekupe.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/magapavalep.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/godid.pdfIn PDF document text
    • 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_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 10852 bytes
SHA-256: 807ba7776b10316a96085bead2f7ac74117ebe8bb02a36db3593381a2204f2bd
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 18612 bytes
SHA-256: fcb19f6272f6f77891d5a9dc283f5dd29387891b71128e0ba1551ad38a6087ff

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