Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5865f839afabfa9…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 09:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea35ff599cff2b6a39f695fb66d14828 SHA-1: aeb003e23cfcc09085b2b32a4c2122ee4e899e28 SHA-256: c5865f839afabfa96a12ceec7fc3f6e03f48e5f57c44925ec8a7404936978658
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. These links are likely intended to lure users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e451d3892b---58698534292.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5gsqik9p5sfo3hcccll142v6ff/wanegeme.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da16310acd1---68242943999.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941db0bd2e2---85809545101.pdf
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/guvovunexovidefu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f96d9e47---7534425121.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8clj3jhiej80ef8eitd190k293/buwirigizaxum.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a63dbe2a---bulafesar.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40aecb8c5---72238484213.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608822ded0717---nusalorijogujuje.pdf
    • http://seabeachthailand.com/UserFiles/file/26333818672.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8969aaba30ef46ae39392fe777e3fa97/sisapeputi.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/nivinov.pdf
    • http://22743333.com/userfiles/files/2949293016.pdf
    • http://elementsgogreen.com/userfiles/file/lubudokadifavo.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/941d06c58203f6df8969639875d60ae6/76202264894.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befe5f2c4b5---nunajusubur.pdf
    • http://vladjurnalist.ru/archive/file/22890645165.pdf
    • http://bannermaul.com/userData/board/file/kewelota.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kp9dr1v0an5tausvfung42qdh7/375783412.pdf
    • http://www.awakohchang.com/image/upload/File/8953376148.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160987ded64287---teramujarabepupogonikex.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/84893912523.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210530_41F85B5AFA7C704C.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=twin+girl+names+same+letter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 16792 bytes
font_01_sfnt_off000115fb.bin
7dc9fbd9a4fc296555746d2682633941b294fd5e6eecafd0252cd4aff05dbc9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 17344 bytes
font_02_sfnt_off00014348.bin
01d85e64f9003c2ecc862e68c768ef0d8860ac2eddcad9dc61376808c027d0a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 10380 bytes