Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f3eb0c51d9dc20…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 19:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0133008d29c0b449620f0ee168d277ea SHA-1: 6d33bf9dced2632ae698c80eb2c509707217e230 SHA-256: 55f3eb0c51d9dc2090d5cb8013aecc38bce46c72cb62a4e30fc6fa9a9c32832a
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yjsyrj.com/userfiles/file/6144330370.pdf In PDF document text
    • http://coffee33.ru/archive/file/21847231932.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06d4813d79---47499237592.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/43980117953.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/xenibinozajowovil.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96ea13273---43787133957.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f815db0f---81199450323.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f978a2d1b1---zuvezevexalazij.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/maledolorado.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfjca042dhhapnkn2dual4nvlt/sifapakigezaposeruzi.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/77506998352.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vp5hg3ioro2firk94ef300vblf/47477686259.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/deviwisokuva.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/75430989931.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/37074882554.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/nexavebe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f809a21224---93887882623.pdfIn PDF document text
    • http://spiregene.com/image/files/20210810_030304.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/2558727500.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/021147224403.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/410419d5380514fd5b48d25d21a27623/161683896.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/26673430208.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/17329574366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kumudam+reporter+this+week+pdfPDF 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 18100 bytes
SHA-256: 4c287c638c12850f304128f2b82c3102af1c06f3833ac2dbbb8141f8c9050d23
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 10884 bytes
SHA-256: 1f99021ba30f84e78e0863377a255391b0b8335bde8b16f3b536b5f23a12fc0b
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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