Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91137a462aa4702…

MALICIOUS

PDF

112.2 KB Created: 2021-06-11 13:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: efc6dd68782fa6a146dc28351b678a43 SHA-1: 2ff9a28ce1311486e56e126869858234dcf7e62d SHA-256: a91137a462aa470227b553caaf505b01751142de26cb3e897ce58dc37d4a4592
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=bhojpuri+new+xxx PDF link annotation
    • http://ferrogep99.hu/static/media/file/sazototeje.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/51389614398.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/72132386248.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160945655e7848---fupirixofujoveloz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2e049f968e7bf40f31b67e1191d1a168/92807966918.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/minezovunotexekipekezev.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc3cef099---velalipozisokejomaloxipe.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160884162281f2---dokoxejomibivawoziwo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tedikoda.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210607_175049.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pazaxowagofigumusifuwo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823dffca6e1---gibuko.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdebd49b835---30747889378.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/jofovedekupesa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/s6n04795b29mrjft720o5tvq03/82503516212.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/34329104475.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc47d652d---lifisozinas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 4576 bytes
SHA-256: fca56ade5f87aa340da771987e5cac3735b900f9f8fa2c01515070b7e3574e81
font_01_sfnt_off0001577f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577F 9608 bytes
SHA-256: 782036e6e78f42587b2f5f16119e1af08344a41df5ff2c8316540f54096aa635
font_02_sfnt_off0001786c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1786C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_03_sfnt_off0001866d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866D 14648 bytes
SHA-256: c28c232e6fa800cf9afe3ab37e1015f1cdbfe7fb14e432b56941a7d47f17e9fc

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