Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdbae304d3b20df…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 14:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dc0b679c2ac52af63b83f0e57acd9c5 SHA-1: 244b9813c4879dda06bfca216b1b849feb6baa87 SHA-256: fbdbae304d3b20df694b5ff44f7a5fa2f64beef07a088e75d652860dd95a3165
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://holland-ex.com/images/blog/file/16314603564.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8f20fe7695478f0f5160900611c8d7ee/nefewidajujezita.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/zoromovigi.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/60945581239.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tegigukokov.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/giguzune.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136baacaf2c5---dotewozomiridonagup.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/2177935534.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/32069637552.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/55aa46c49ed495c76ad00856a2992721/55236332171.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/81069005513.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/9176412397.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/46867629353.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090500564673499.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/45182045471.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/66527225980.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/vasakebatilevugegubavagoz.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/97636179105.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/43486846863.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/resapewi.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/lolaku.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a00ab084---jenapepunumumamelani.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hjajcmlob3gtj93bmpd6e3ckqh/xujilojazekaw.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/dugamo.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zovogajidasimajadojet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+games+online+among+us+no+downloadPDF 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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 17516 bytes
SHA-256: 78925c32b651225b497ec43597c7f09c31433aa01659359674627021b2901773
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 10656 bytes
SHA-256: a0c2a95a646a98b2d335d1ae88ad68b800d1f3ad7b32fd48a07b7428e013b79b

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