Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a73f56928a2125…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 04:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a737f924af14a7742d6de697c610daa3 SHA-1: 437a60c7beb70a5f3551497d7d3b94f04ddea081 SHA-256: 83a73f56928a212570e8c3950f51fa2a609013cd0a5a27d05d83b6f3eb87ece8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised WordPress sites and disposable hosting domains, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://irlanc.ru/uplcv?utm_term=what+is+the+simple+past+tense+of+go PDF link annotation
    • http://bettynblue.com/upload/fck_img/20210515/file/tewipimup.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/37340894662.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a225705e202---fuzixoluwolez.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8473153d57b6317d69990aeb883b1f78/fekadavuj.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/zudabuxaku.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/61361008678.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/semukexusogigo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d012e455de---sukosiluk.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/mutexipiw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/futarezasan.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/33217242916.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa5f19760---22755590302.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hg6okuc7bvkcbu4lsgoavesmeu/16580113694.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c589be4e01e---46052336627.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a013ffaa483---wojujojuxemutorepago.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/34e6bf165d78164b6f2e31acee0f635d/60684532313.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/90221035444.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/78040253030.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/12891561805.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/wirikesewapuru.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/s5uhvvg2erjp4pejia01va3gh3/7786995526.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504024450734264.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10700 bytes
SHA-256: 3403a970cd3379532e7bd0ec9a74cc9806c211960536e72506b220301dad7c04
font_02_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 17120 bytes
SHA-256: f70ecad06052977b024931a9ae3f921024b133bcab5f561cdc083b6d08d72c6e
font_03_sfnt_off0001456c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456C 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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