Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b393c150e015a90…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 14:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b73e358f17edfbc5ce363af4b4db2e33 SHA-1: 3a5359ac0a6903d809fcd6ab24f7679e378105d1 SHA-256: 1b393c150e015a903a6838f472b057ec6c3880e624a2715900d24fc0c88bd0d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and employs a payment redirection lure, suggesting a phishing or credential harvesting attempt. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic profile strongly suggest a malicious intent to redirect users to potentially compromised sites.

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://elskenecologie.nl/files/zababod.pdf In PDF document text
    • http://beiks.info/public/file/bapojo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/81538263898.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/79201114174.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0gkpb7qmo76ilblq6a5plnulqi/difowu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/97560691210.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda395fa11---wokixibedanev.pdfIn PDF document text
    • https://rippa.pt/files/file/88644514876.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/kaxaxunewesosedikidax.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/magurigofenutop.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9902223c2a4dc144c5b20527154fea59/63498265235.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/malipekoxos.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/68727060363.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/gupuso.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/sopolinuzadazivejox.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ni9aq9mgvdconf7tsnci0dgp90/4875495741.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/5509039099.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/84663488074.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/79005225935.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/53728584151.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/99366278433.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///benepamu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/bosekivegisom.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/rexalininalobimupovagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+past+private+ig+accountPDF 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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 10744 bytes
SHA-256: 1975beca49f8a17c2bed60ef93328a0785a353660248720bf3ef7e8d331b1a17
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 17488 bytes
SHA-256: 2a7991115bffa62586e520692dc644bb047fff1fe718c5c064ffbc40433d2935
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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