Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fe296fddd8226f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 12:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed92dcc8a2b4cf321961d7c4b84319e0 SHA-1: ff2c02b5e0644d88a15617645ebc4f128261bc2a SHA-256: b9fe296fddd8226f63be09643b9d3194fa0156f2b43bb6940520ac356a712e1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or to distribute further malware. The document body is unreadable, but the heuristics and URLs clearly show a pattern of malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bigdoughpizza.com/uploads/files/lojunusuneburiku.pdf In PDF document text
    • https://aimhc.com/userfiles/file/26756865588.pdfIn PDF document text
    • http://congluc.com/upload/files/79844916032.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/77068971820.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/molikowagaxanonoge.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04a159859---50212121416.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/05e79abb7b079688ddafac504e8ab725/29364774764.pdfIn PDF document text
    • http://klpa.net/userData/board/file/tusikejutidafi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/28314698244.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/jukesojulorumatorago.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62a8b289---79152539634.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3d4132ca839a818dca224bd527c044de/5777051776.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/26449324453.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9a16ecaa34b7e20debe34025ea438db7/xinavavefotoxupilixirome.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/foevree0991erahl1gfeu0j04b/55283689978.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/balebu.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/lirenobetiratakuxu.pdfIn PDF document text
    • https://ewt.cz/res/file/23548525936.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/95892920701.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bdbb48fdc30c3f59a87e193fa47a19d4/naxefuruputajux.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/juzojijunujuforositog.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/lakepulawefegupexux.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/malojubajijexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lyndal+roper+oedipus+and+the+devilPDF 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_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 10728 bytes
SHA-256: 88be0e44c7f543d097c5eba3880c518dfaadfd341f6e827e0f4e37e51f7ae4e3
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 19300 bytes
SHA-256: 2e136b292190f93f97316e950269eaddfb2ca99fc698df97e03aaa19454a7636
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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