Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6177b66d27da298…

MALICIOUS

PDF

92.8 KB Created: 2021-07-19 06:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f12b0489ecc64bf0a5e6752972c851ee SHA-1: 9ed3ed609e24812f97e020ded8c95d1298816789 SHA-256: f6177b66d27da298d4100e492dc1411b6e43ace5914de01c025e9dc7d342b09d
196 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 WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://developmentassociationofnagaland.org/nbloom/fckuploads/file/44080343319.pdf
    • http://scan3dsaigon.com/upload/files/99032836412.pdf
    • http://k1a.ru/images/files/file/47221245944.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/kokuparapazenubegogokab.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607293ee41f13---siduzelepupolura.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/74paq03tf5ucjbn1ov5u3r57p3/sawurosekizise.pdf
    • https://akapacha.com/userfiles/file/82348537208.pdf
    • https://drinkpoint.com/uploads/files/jinevefuxakovo.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39426484---xurojanafogok.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sb4dgr0jmmh57hu68mi9ve11n4/58146006984.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5673fdfa3b8f64185c8958c35d5afe8b/kolasosexevomaliguzibix.pdf
    • https://marblobaths.com/app/webroot/img/files/40837017652.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/cd48e5a627a07eb39096b5e754f0abb6/1337864022.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8e8bbaea---22605650668.pdf
    • http://thingsantiquesla.com/userfiles/files/35248040211.pdf
    • http://braciszewska-klimek.pl/fck_files/file/37290264509.pdf
    • http://nowator-zpu.pl/userfiles/file/gofuwefedojisurevo.pdf
    • https://unicon-msk.ru/data/files/49901873654.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fd486f57b5f793a43e58a16b8bb776ea/zafejokuxawazelajuvumos.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/6ll9maeort9e1hu1plugli3jsa/pemumodabezimogaxatizo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb41e53---57951608373.pdf
    • https://xlspandoek.nl/userfiles/file/mokizipaputekab.pdf
    • https://ivaco.it/file/rodofofolewok.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/314ehd5bp5rojhef16eu0oc3a5/saremubitun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=block+letter+format+example
    • 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_off00010938.bin
a8acfbff21cf46ee65084e1a7e89dcb9639accf08ad0cfcecb5c3801df6cfae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 17308 bytes
font_01_sfnt_off00013606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13606 16792 bytes
font_02_sfnt_off00014e1d.bin
3818810e6315c20a02bd53b4bfd383d2967cb8d31184259d593e10fb0facd1ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 10524 bytes