Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11b1801e16f6d7c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-29 15:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 523e92120f2fa3a402e876795c8fcd1d SHA-1: 06838061f5782a106e32d68adade589ce95cdc54 SHA-256: a11b1801e16f6d7c1a79aa47a0b3159fb5641886faa3501bf0d4a5394bb4e1af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The heuristic 'SE_CALLBACK_LURE' further suggests a callback phishing or tech-support scam pretext, aiming to trick users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ketchas.ru/uplcv?utm_term=reading+passages+with+multiple+choice+questions+for+6th+grade PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1be4405af---84887590451.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161026acc26cc7---nasajutedolizenorog.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/bazevoponepi.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/64356925209.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/forumetekupif.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/ramobesazafazugizol.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/52429973283.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/a4d8n7q529s0kb2krf4hcohf39/9270939421.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/72416413508.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/wararuzajo.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/39352108100.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d89d2fec---gebison.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/83871854969.pdfIn PDF document text
    • http://fructusartis.com/i/File/nefoz.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/civ9h5h4djlanflqrkvelm86ts/50915253763.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kkub0brfmrgmg4jgvucgmdsm7k/jinisunofeworen.pdfIn PDF document text
    • https://beaszemin.com/files/30598260310.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7m3lo9m6bdaqggicoeffa2a27/41280137731.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cf2c750e---70113800576.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/27825034008.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/52147124386.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/dugixopogiwaxanutimulus.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/791471a78f9251a029ff467df0242b08/99551164828.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/60861656024.pdfIn PDF document text
    • http://dentherapia.hu/files/file/55224801887.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://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_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 11612 bytes
SHA-256: a5bf9433ff5d497140065ab9b0023085fa7d309700f6be55c66e1b538e16007e
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 17684 bytes
SHA-256: f976e9ed041f4e7b71b6e74d01663bfb91767c76540082a2eccd11abf0b0c886
font_02_sfnt_off00013094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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