Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c6fb37a94675f9…

MALICIOUS

PDF

88.4 KB Created: 2021-07-18 07:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5649be5ccac66f9c72ec4949c326c943 SHA-1: 55e4521076e20ceb7dbbf5179084609cabb7d9fd SHA-256: f9c6fb37a94675f95e44d9e4c24bbf6d3b8e2f029efea644d689b5711e0050c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/95171118948.pdf
    • http://uptownherndon.com/uploads/files/jinapavosuna.pdf
    • http://mwflower.com/upimagesfile///59347139099.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/044479a8080fdf701b564917921772a6/wuzizod.pdf
    • http://vattucongtrinh.com/userfiles/file/50175451313.pdf
    • http://cooperclassof1970.com/clients/9656/File/sedazi.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/betifunakokumagilopene.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079386d0b621---59404852572.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7ld3armf5rjh4npl21h5rfe5ln/garoxoz.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3503c582a---35669644089.pdf
    • http://fitviewer.biz/files/file/66001404386.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6fe2e66647ef2bbc45c473801444d625/luligi.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50d677ab0---binupateloso.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e0e9b6136---98651347791.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210604174443.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mu8017r6etna66d2fdnvq9gh4v/vivikasekulabexinisut.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a426f6231538a86fb7a9ee4d627f338f/71767507055.pdf
    • https://marcuspietrek.de/MARCUS/files/file/sirur.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4b8fagh7qgfgri0n8qjt9nc18b/kolamutasuremo.pdf
    • https://shiphangnhanh.net/uploads/image/files/16570564599.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099fc42bc782---54680307153.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083913aa42ea---85059499124.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/252c6b04315d5f4c999443a269c30acc/32589990255.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/c7utj46lonpj1ogr607fc847ml/80651860711.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=multimeter+how+to+use+pdf
    • 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_off0000f63f.bin
4b92b1dc3795218ca183dafc5736af86a2eab8ca52172cbbb1089e0d8f152116
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 17000 bytes
font_01_sfnt_off00012278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 16792 bytes
font_02_sfnt_off00013a8f.bin
b3224a41c4af8e328e419f87e6238b3d2cba8b24ae9f77c182a2cc03c55eba5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8F 10676 bytes