Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8fcc7fb1dce56c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 19:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9926b0e92b29b21a043e38550f577959 SHA-1: ab247b5722fdd117e550c587d218985550469af8 SHA-256: 7f8fcc7fb1dce56c52ff073726e508dc972f1d934852dc7307c72590c12ecb13
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1bd69d430---20043824560.pdf In PDF document text
    • https://marblobaths.ph/app/webroot/img/files/suvanulakezuviz.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xarid.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nimijuxamegisufefo.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/17853362041.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/luwiporokulamadokeji.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c649d1980ee---sepemadab.pdfIn PDF document text
    • https://keongracun.org/contents/files/94592827883.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/fivomitigujilewi.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/kolilexajejogik.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/agu310sm8s498fq9luc4pqti44/30387681926.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7675ffc6f3ba12b69786a04d76133cf5/nepaliwaj.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/jazuju.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1849e4ec6---jeriginogilobezazalul.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/vuxopi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b842da07420---80684135640.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/975ce7c959225432a76ae4ceec4a37af/86024779143.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/diroziwizolidixodezi.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/97459168276.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/45559225712.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/17032209925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=limestone+coast+map+pdfPDF 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_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 17588 bytes
SHA-256: 2a90579174a2228909aaee893727f8bd0413c1c15e73a56c152d045dc70df2f7
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 10592 bytes
SHA-256: f0c7e48f33a3166fac34df9845e6e3fe9f0c5da5c2e279ad57622a303f1899b8

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