Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbfd2c36698b664…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 11:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2d22602d65cc0b740be10497abb239b SHA-1: 04a7d92dbd164bd5d3f7fc0c545f96393c52bf6f SHA-256: 7fbfd2c36698b664af0f660624e0a71fc86fb5d84b6fff09a83b4e369e6e3c12
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites or download further malware. The presence of a 'callback lure' heuristic also suggests a potential phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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 https://chcial.ru/uplcv?utm_term=cat+in+the+hat+book+free PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16093471018a1a---tekelalovafovaxixepo.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/gipegiladanevavezevetufu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/vizovolepabipuwepiru.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b61511e75---jaminineloregefejub.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092039a68913---zenibibusodusexetelapeno.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia59iqeqfnra6jornppccvf0j3/bofajerova.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7894ad3140a78137d33dc63150139cd3/78515990948.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/satitigaki.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718e132c397---taferalimi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92389e846f02cbc46772da64dc549474/gutaganinawe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fd3a31da---kujuwazon.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8k6es3das5utrigjniasd37du6/8656581719.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9077e75d4a---xogisame.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f94fd5dcb21e77ac270deef99b8a1604/topapisoxejoredidurev.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/83683333496.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/33601661010.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a040fa988e---papugefafeli.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0908b832---jexefivasuwubivivi.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/57515829941.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/nogifopefurila.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/64201380753.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/dajogip.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2h9squncvhhg2kfrqksqq9andq/96991325958.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jj493f5lkvq8d6e0jgf5rsfqj6/rokipor.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d55c239f---62736547099.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/seruwatejefonizixafemopox.pdfIn 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://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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16896 bytes
SHA-256: 164a1a74366f320d08a96fcd001e008d022f7a66121098793eb51f3fe07946cb
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 10360 bytes
SHA-256: c92cfc34a34c7d3e822c880659c4a0bceb02d1824c09fa2c2639991d9bf92618
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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