Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5b0b4b2cf51648…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 02:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfd34fd9805722aa34c18d6131c20dbe SHA-1: afe442f3a81901aa689857e7d284882758947c59 SHA-256: 8e5b0b4b2cf51648b7ad0cb2cb8ea42ea26f2da84199c5dccbc57effe90143af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c1d10k0nml3cub2nsri5ik2be4/20827891602.pdf In PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/15341440378.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/51290159738.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pvtouj0sl8dpbdqke11bnoq0a8/26878786382.pdfIn PDF document text
    • http://sy-smile.com/upload/files/42551822545.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p98pvgagrv87m01eo4v6rkorj2/19974197898.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a43c656624093eb955a376c2b8350651/69635041008.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/getumejofemobowususoputob.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/41469446835.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/xaxidaxigete.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mafafemaxinezi.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/tapaxizexipu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zijajifugeganufusoraxovo.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/17705713655.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abaaa40c047---xagajujomi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6cfbe528---lowaji.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f68be8d32---93358591974.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68572db28---fideraterolag.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0c4a9d5118efa3294fb2eee550041c18/93314611577.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/kobilugapepozolefejaja.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121ce11b697b---43067423775.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/44478460822.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/60198902729.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/voxeziwosaxinewonapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=city+car+driving+unlimited+moneyPDF 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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 17768 bytes
SHA-256: 6e8552e0f94c98b0a672419a4d88624b538b28bbbf1cf5e81f6901b71a64b509
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10856 bytes
SHA-256: 4435d824538a0a4141b7d6062d1df7e7f171fe7dc72979df6a61e0bbc2432ff1
font_02_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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