Malicious PDF — malware analysis report

Static analysis result for SHA-256 268d248483e608bf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 15:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8f842e0e44c19d0fd3176e79cb27bb9 SHA-1: 1bef87142e929c2baa85dd90e29ee1b549650ff7 SHA-256: 268d248483e608bf318e7169613a61c1dd027ee659860b5205eac464f1a1efd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links.

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 https://cornwallstaffagency.com/userfiles/file/xolapipefajavimimomajaro.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8307e8b7---kevebipuri.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e3na94gmbs7hk5gmvf0tiaeg34/lowuvesiluxo.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/jixeluz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076e8fb07e5e---3963257202.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5367d2031---dapebire.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080903461964.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee37ad71d---kinugorubeferuwoba.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/getidafekifazavo.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/bilogujukimix.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/84007310070.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e9e9b36c2---borob.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dosigominosude.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120cb85afb---bajodukemujanakonupepusi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/96583320638.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d9aebd0cab9ea7221dc729571e6f8fa1/rezibozow.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/32282582663.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/vobovaruzodiket.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ap1khfmtpkp0dgbt0mf6cpsae3/45378174043.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9fo16iu8diddaidoavpjrt1fqf/2482942048.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d6a48c0ab6---tikotezizemikosumiso.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/talerig.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/xebuvizewipabuzigone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pure+and+applied+research+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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 10600 bytes
SHA-256: 40faed6b4ac73e5c880878a62fcdfcbc9dfb1a1f00b0c94c278fe900151ad6f6
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 18116 bytes
SHA-256: 0bc92fac51f981c9a5a0fe3f6e4ee958dad7c8c2cef9b104587c6e5a35155564
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1