Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffc528e4b3a831e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-21 04:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91217e4b5e9e6bff6d2a07787b68b696 SHA-1: 5dbae8579bf825ed44087e3623706fefe07ae5c2 SHA-256: 4ffc528e4b3a831e034f17e631a81c7e8a48e163ef624a47563eb34ab74a4d00
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, further supported by the ML classifier's high confidence in maliciousness. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=y8+strike+force+kitty PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4343e8ef---70036626361.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/99025a16d3a99293e4f70bd77cfe7905/fuvonekasebafajaxokiliva.pdfIn PDF document text
    • http://afslab.asia/upload/files/27840798239.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/87976802731.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402408b0bb6---sizezizufizanuf.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/25615212981.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/85031479003.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/63536763173.pdfIn PDF document text
    • http://accronline.com/userfiles/file/87857065211.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/39506867877.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/10635850186.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zomiferudekobexip.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b88d9dc525400f6cba16b7555a3f61ab/mapixosisabet.pdfIn PDF document text
    • http://juha.be/_files/file/42539909856.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/remalunuwifiwad.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/boxaguxamelinowogidamel.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/sinegebopowilulevaziti.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d844d194---66038369837.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19520269885.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/22773148873.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f7638448---38642403686.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/65580950161.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_off0000bab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB0 17656 bytes
SHA-256: f33558a16a26019d632d4eb9ea220684c4ce677be9fa47556c788ef4ba903401
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10416 bytes
SHA-256: f82403a3c5d4e384e15ddec0d982d6b69633b073a5f67fddb6616b7ba62a4f03

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