Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b21e1214d09cf8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 07:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60cfa2617fe823865a099464d0800f2b SHA-1: 313e0288b58f22debb2e604e000b4b59cc7983a5 SHA-256: 90b21e1214d09cf87bce704ce0530708cf06fc12eaea15a8ce62bd08acdc74a7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics identify it as a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs hosted on potentially compromised sites reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/64c0267a6ef2b2822cedb47f68cc6b22/lajaroxarakuvibadeduw.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/17c067c990e1dadda7d2ba8aa8f2055a/furetobid.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3b127a6ba137d321d02bcf6d895cdbbf/3386215085.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/luralawixexaxularijaxa.pdf
    • https://medsplus.us/admin/images/file/kejebuvasox.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vfpagtboku8gl215fphnin2267/viwemurimefetu.pdf
    • http://vasset.bg/userfiles/file/japefa.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5afdd6b2b---52595715323.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76c943c5e---33606057403.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/41s0majihrcnsn1avd6pqvno44/ribatobufav.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/xujufuxifajudezuwizemoluz.pdf
    • http://aelma.com/sites/default/userfiles/file/womasidesofajubegow.pdf
    • http://seoulmenu.com/uploads/files/83846298457.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/s8kjqa1unst0prc4hdvul40mq5/birunokufanez.pdf
    • http://suachuaspa.com/upload/images-content/files/55160518726.pdf
    • https://ntiverification.com/userfiles/file/babizotokexedifavowuxelob.pdf
    • http://citadelcaralarms.com/userfiles/file/5911786828.pdf
    • https://hogozaty.com/ckfinder/userfiles/files/mexugixawimupigifonov.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ce32416069a9e0ae7d8d27441daba09/vakigupagaresijeb.pdf
    • http://www.anclupnapoli.it/userfiles/file/4973266897.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/g07ab6vsfpnhn2m4105i1qdvc6/81965069970.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/93135842135.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf336638c---84434008382.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fga15n120+datasheet+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_off0000bd66.bin
9e5765cdc858d82c34bbac90f1e066152a6c32ce802e29512c7ba21c53b09ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD66 20792 bytes
font_01_sfnt_off0000f2fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16792 bytes
font_02_sfnt_off00010b12.bin
6ae6296bf850d393d389349e79848b138a7053363573ade0bf5baffe0622dc1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10824 bytes