Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd9ab2b7c5a7760…

MALICIOUS

PDF

171.1 KB Created: 2021-07-09 07:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb3f6034e08d0cb60661bd170d419b7 SHA-1: c206678a5e5a3f383a6ccf2d52f56c404d4bd2c7 SHA-256: cbd9ab2b7c5a77602b05f44bf081227547a2b2ea63afccc0158d6dbec4460d8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/g7ig2gnobc2v7egi7j8fokh0mm/fifogofipixajakadifodami.pdf
    • https://aradovan.com/userfiles/file/tifetunuxuriragewezidaxus.pdf
    • http://baugeraeteverleih.de/benutzerdateien/27739048992.pdf
    • https://myphi.biz/nbloom/fckuploads/file/zunosanenok.pdf
    • https://newtech-utm.pl/userfiles/file/sotilakuzotukuvukew.pdf
    • http://jfac.kr/ckfinder/userfiles/files/60162353843.pdf
    • http://novafish.it/userfiles/files/85134840801.pdf
    • http://dongshengcable.com/images/upload/File/ninamedobodenafa.pdf
    • http://autohondl.cz/userfiles/file/79686224335.pdf
    • http://foodchemsino.com/d/files/31347491712.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6a7569cbf5d13291c82a549fe3d8fbc1/6855288927.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/357d1d19c6f9362e3e407d7b8c24b139/12131940158.pdf
    • http://pressvaluation.net/userfiles/file/53897338646.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b9a723b0961a6988d9910ec5f6997a0f/50056027600.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/lobavafeluwewov.pdf
    • https://zapret-rf.org/web/img/podborky/files/34377680029.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/goatkr4ghircnluem59r3ih4b6/ruxukop.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/revijivosasadapidizafo.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c4006e93376380cdfdd13c3722a516fb/61121545183.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d0cb626d---2460504441.pdf
    • http://plafondchauffant.fr//img/user/file/9945071696.pdf
    • https://bloomlight.pl/_bloom/file/95013469632.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/jozezejaw.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/nujpuisq41hsa095tp73t0deij/89057186107.pdf
    • https://bbpartner.cz/userfiles/file/temutoka.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad604ce1509---bilapifepusu.pdf
    • http://gandolfiarchitetti.com/userfiles/files/63504106002.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=diocese+of+malolos+logo
    • 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_off00023ef4.bin
febdf199bb59901aa50307737bb84491cdc56801d21edfa09f8529de47e0db5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x23EF4 10376 bytes
font_01_sfnt_off00025669.bin
12c299fd430c1dfeb163078c5fdfafd0a1b63afa52d8d4262b53d432b800cf79
pdf-font-stream PDF embedded font (sfnt) at offset 0x25669 18396 bytes
font_02_sfnt_off000286c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x286C4 16792 bytes