Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88a0247e4b03c45…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 06:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77c4791c3aee0636571964099b565446 SHA-1: 2951cb5bba9eebdf749deca6f8967313e7e5e5f3 SHA-256: f88a0247e4b03c45e62200a26e6bff90a9e05987332ee4f5691dc65a75480c50
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, consistent with phishing lures. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to prompt the user to call a phone number, a common tactic in tech support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • 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 http://inruho.ru/ckfinder/userfiles/files/38336580694.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed134b5e50---97071328971.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/19990837459.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zosezufojudosovatopomi.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/33295321894.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/zavafinevidugumo.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/11961223447.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/82709534989.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7578c10c4824e6b106ca17fba346ef0d/16338684434.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kumiboforened.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/pukabinaxegaxibigamu.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210909033441.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131bcea0ea98---32933492569.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/luvarodufefiwuj.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161346f06e6db2---40235119072.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/4160301469.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/64497672465.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/rapigew.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/jevomimifiwepuweminojat.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61307498ecb6d.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/83094391420.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/sexan.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/52071951874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=91+pc+suitePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000102a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x102A5 18992 bytes
SHA-256: ef334b6389a9673db2578bd46fd7fd369f2490a9b86fd82e1f54248e002869db
font_00_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 17472 bytes
SHA-256: b29d682f899aa530cb6a143c0a24388c98d94c59c1db73fbc2736fc02309425a
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13936 10056 bytes
SHA-256: 4ba7e99a1f0a95386c67fdc1d46b3b81c371c33bbc5df0c040230d75326168fc

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