Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2ecf8ffb69c469…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 16:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 53efb9bca035bb9ad3fe9d4364a070a9 SHA-1: bb02f20e12744a195692ab8d10a6fafd0893e2c3 SHA-256: 4d2ecf8ffb69c4695cad3160efe8bd2f409847a6229c27f07ff28bc959fbc84a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chungangroup.com/uploads/files/202109120820138014.pdf In PDF document text
    • http://101balkon.ru/upload/files/gezegonaderodokes.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/33671915019.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d39d74c2---punikebozeso.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/taniwulema.pdfIn PDF document text
    • https://spyboarcams.com/files/81705957771.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7e23ec88---munugalodavodezun.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/litaval.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wegazadasiligaxojujaz.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/vogimiba.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd882d6c2---29870789840.pdfIn PDF document text
    • http://villkasz.hu/editor_up/83071523142.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/25005480116.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/sepizulesi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/50637711038.pdfIn PDF document text
    • http://idroter.org/userfiles/files/33641818900.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/jowejilivuru.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/65140299434.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/36643634393.pdfIn PDF document text
    • https://digireg.ch/upload/lufiwefuxeketuwu.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/vixim.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fadezozujadeb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa2a9354d---gimudadoranilopetunowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+the+office+season+7PDF 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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 17872 bytes
SHA-256: dff638d44029af4dc46d93e409ab18f1e2a364182f937246bde20b205a3cca72
font_01_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 10332 bytes
SHA-256: 692d8e138230e2c074f95ad3b16b339e69e7e23a28e2c9a742090f4587c2f604
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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