Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af953913adb6340…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 11:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b637d42bc154e1850c04e377d27a4774 SHA-1: c54e99d4fb579c761a7b62e4d87b94f2fc57a979 SHA-256: 3af953913adb6340b446c7c1270ec07bec16db65af3d5ff1234de2e1cb03e076
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on potentially compromised hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a phishing attempt, likely aiming to redirect users to fake payment or banking information sites. No scripts were extracted, but the numerous embedded URLs point to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://santehnika34.ru/images/file/88794969028.pdf In PDF document text
    • http://korytnica.net/data/files/96959154144.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/kutowise.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e591c30a---82435840202.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/24392574114.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/80766121389.pdfIn PDF document text
    • http://stl-hk.net/userfiles/fitumalobasiwagopezibiv.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cddf37b9---lonupixipuruziz.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///30775902372.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/96488129468.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/66003411465.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/94588846194.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/kowasigumukoxibada.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/galelad.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906152041.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wabux.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/55112169029.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/fomiwofunukirasasimegidir.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1322f1dc65dab7f483c9b89c128f7c23/50270094727.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/32673545534.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/36330050831.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/debotadapuvijuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+transfer+whatsapp+messages+from+android+to+applePDF 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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 18412 bytes
SHA-256: a0669a176a7590c340788d89ed0aac128a0386147a16ba51348734710cf46745
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 11020 bytes
SHA-256: ffdf3017c350b1eac867f50e1a538a9b89cae30d042179f4676b99514748d184

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