Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1345e3ea606536d…

MALICIOUS

PDF

118.9 KB Created: 2021-07-20 13:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c406b72eeb1203a151f6e1e489be2c7 SHA-1: 0f2807294bffe8c1f03b01a0d7d7886c0737f179 SHA-256: c1345e3ea606536d562ddef94e90c022d241fa97466489f846e3cdceefdda387
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the use of external links and link farming techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://metalltechnik-kutschi.at/54342537202.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fmfte90cvqiojneaigi8ped811/87504249112.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/76586412905.pdfIn PDF document text
    • https://areicon.com/images/file/lezesejagowagi.pdfIn PDF document text
    • https://primer-spb.ru/files/files/53289066790.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcf44ce47---25736318994.pdfPDF link annotation
    • https://gemwares.com/userfiles/file/43274114708.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6cbea90bc---87580841800.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75a42d33b---2113698349.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/vaxonajipisikowonozex.pdfIn PDF document text
    • https://recrut.com/files/files/xadenatom.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/48079363331.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb7f90de6---46811676763.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160940a443da7f---63998351474.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbdf193a3---98681753892.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/28406427009.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687db41f77---12686596523.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mo3210pomkk0jhhev3c36h3lq0/wesen.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea06ec540---16747935371.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7f8dc160---tibamanunugobamejimo.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/43841243255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=john+o+groats+to+lands+end+cyclePDF 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_off00016b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B72 10664 bytes
SHA-256: 88b4435b90c57f944338619ded14402a31101f0a41cf4f59627a0d1e503286b3
font_01_sfnt_off000183b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B5 18644 bytes
SHA-256: f52fa79d3f0137a5aa5991a7dd0138c98d2f11a28f756a39cdd750000a5a8d74
font_02_sfnt_off0001b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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