Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4e5bab686e5a34…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 03:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d539273f8dab2aeccadf914c87c35d18 SHA-1: f53bdf377bc2bb954cc2542bd03d92c9510c2e35 SHA-256: bb4e5bab686e5a348b68cbdce39c24ceb476df088eea75b52693f8c260e7a2bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a fraudulent phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or host malicious content, leading to the execution of a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://commune-bourre.com/userfiles/file/rijinugajamu.pdf In PDF document text
    • http://kozelskadm.ru/files/uploads/files/wizaxinulamuzitizaman.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tjlantnu7t0udbko8287d189k4/gemovuxaruliz.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab569a7f3---50021965869.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/kegizadux.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/jefadudozarumuzodugofekij.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/febiwok.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/85328480944.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a6d5119933a2743f918f729ecc7e064d/wosavadam.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36752a9c0---55587336745.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f937f4c9f6---89029236016.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/vazenerobogoxa.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6126dfd8e911d2bb9d2ff0d06a1a088e/nesukevolijujuxobebupili.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bb9d30f9b---vabuma.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/titabi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/cvt4ud5csbig0eif06s7039sit/34948635236.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/67239170496.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b9310774a70---kejanutosuwujujirofevumid.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7fb4ba25---dujebofipa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eaafda6940102eba87f67c7da33a3dc6/43668554843.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9df602e92f0d5287e5ef1f6b08fb4338/42244685967.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/dajot.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/gasabobagulunuf.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e70d19daa9---90008136747.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/wegijoradinatesapewitogop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hp+elitebook+820+g1+notebook+pc+manualPDF 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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 18244 bytes
SHA-256: 3abb6a8cf163b0ff68dba12f3de2ecb8e57ea48ab02b647901660b34605133ab
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 11272 bytes
SHA-256: 5e014972c0b0499f7b60c354d553455dc12e84c24bdcde4177402f00a21fb88a

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