Malicious PDF — malware analysis report

Static analysis result for SHA-256 4421d92f3d9f81ed…

MALICIOUS

PDF

79.7 KB Created: 2021-10-18 12:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1238aa91fe64fcf2b18f1ed900ee764 SHA-1: 7c13cf7bdfcaa38be4303b61192e40ce7ce7d0a8 SHA-256: 4421d92f3d9f81ed7cb71b7d6a228cfed477fafeefa587af56b88c5a401ae5f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the overall pattern suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://parc-hotel.info/file/76382919495.pdf In PDF document text
    • https://theipbuzz.com/images/file/guvufip.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nekarob.pdfIn PDF document text
    • https://cartolmania.it/file/nisidoludijukava.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16305204179090.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/45a647e90fbea87d4dd78423c08a4e3b/tolodobebukitexididolikum.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5b7586bf7f03239bb8347d4c111e0c4b/64347781697.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/497350327.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/pidedenafuxamozata.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/19248809824.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/tomumutubotaweki.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/22207573225.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/38817375550.pdfIn PDF document text
    • http://abc-tel.ru/data/File/86584210456.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/vegotozaxepopod.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68620591042.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/menajikev.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/dibumudusifilodaxito.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/67620641588.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ade5423d1---5221184456.pdfIn PDF document text
    • http://terminsk.by/pics/files/xoravebedibebu.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/65314860469.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/mexobumorivefudawazakalo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e743e68515---loxirejaxavibe.pdfIn PDF document text
    • https://jensbrode.de/files/file/41311481892.pdfIn PDF document text
    • http://camonetinternational.com/files/file/35891949765.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=dimensional+analysis+for+free+convectionPDF 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_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 19368 bytes
SHA-256: f08b373e6369ee7abbac7def621568d10ad2b879a6e0f4b9b274114dfc8499a4
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 10676 bytes
SHA-256: 7cf4619254f0e5142181e0e1a459bb9bff97b81f97cbb33a4c27fc1abf72a2de

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