Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7f5b2fb39cdbc…

MALICIOUS

PDF

94.9 KB Created: 2021-09-14 12:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 250937956328349d6f9359b5bb4be3d2 SHA-1: 48f470a588a0efa23e250a7ef34f00f6d7ed79b0 SHA-256: fbb7f5b2fb39cdbcf431bd34f085a2e3b5d37ad8cedcc193c2372bdbdc981e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm. The PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://zamaro.cz/images/fcke_files/file/lidagilarafenited.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///lajuropali.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/39900164168.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/95661472875.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/gobazimowepuxog.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/lixokugufitesisan.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/57924065559.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/84745679973.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/63250899314.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1ap6mrhlti7uoj7nks3pr8qgdq/juwuravi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/48258893484.pdfIn PDF document text
    • https://tekartltd.com/upload/files/tajukubir.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/54475200053.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0f0fq9rho700aqcii6oti04bb1/26475184471.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1dfrvhgr7is1vbp28kmlv2hplf/86405137248.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/64565006496.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090915093177.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/tuguvupofowi.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/sevogokakebobu.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/fawikinofak.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/fizamuxajofanofemuki.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/32002035764.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/63425061254.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/60323269911.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/ketabefij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kaal+full+moviePDF 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_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 10064 bytes
SHA-256: 4b712012bab51ff1e93e5558dd1d1ac2502b8e2cf6d3a42b5e19df8b94481cd4
font_02_sfnt_off000140fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FB 17456 bytes
SHA-256: 75e5590e83c742a0b89e595175a220c87ed8fbc468be96dc726f7c78cf015ddb