Malicious PDF — malware analysis report

Static analysis result for SHA-256 8277d31dd464e081…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b46d311f16d98e07f7501e9ff72836d SHA-1: bda49c80fc2eb4addb8abcc5786ccb6f0db78655 SHA-256: 8277d31dd464e08141e9e4b1cd697433509747561426468b7f42eb2d231f221d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern, aiming to trick users into calling a fraudulent number. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607802c6d29ed---56029406931.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hcf2s2sskv2nngkca7jrao0q2b/vazuzovemaruvuvivoboref.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21bb22afb---livokezozilonoziwevagem.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f25a24ca9---75775654168.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bcff0cb5133516f11393d5b4b721dbec/rotofopowevikozepaxofa.pdf
    • http://ebiocell.com/uploadfile/file///2021062300170511.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54860981fc---siwagafi.pdf
    • http://colorfusion.us/admin/images/file/fiwutunixojeru.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0ae99442eb458cf37bf4bfedc748a260/55285903936.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4hg5og777t2e6obeo4vp5dc860/66883561187.pdf
    • https://t2sc.me/userfiles/wejevonefitenibekojiva.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/27064548757.pdf
    • http://moyamoya.center/images/hand_uploaded/files/keberavikivu.pdf
    • http://nsfeed.com/_UploadFile/Images/file/52797195225.pdf
    • http://sooclose.eu/upload/File/50036020203.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081212b0ea23---vuduxeted.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f37mvb10fjhf0as7vko47105q1/36441869253.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cd77515b---vinokixibowilabiwijosuxa.pdf
    • http://absolutelyneon.com/userfiles/file/75935344399.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a4401edcedbd82884e3139dcfd8b3e32/79386699023.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d700bc13---9452739628.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/35400071395.pdf
    • http://greenbrier101.com/userimages/gokifoluru.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb852b2353---tujozikulopagadalal.pdf
    • http://yuanyoujie.vip/userfiles/file/16288776797.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=love+law+group
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e706.bin
a85d90e080c18886049cc1130a792e88a10e28186f73fa216534e3d99b5f2630
pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 18196 bytes
font_01_sfnt_off000116e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
font_02_sfnt_off00012efb.bin
dada06f7c95cfca43dc3b2975f8cd50f1bd8dc4e712ed96417c5a9d1ca30f4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 10172 bytes