Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffac2a013090f762…

MALICIOUS

PDF

114.4 KB Created: 2021-09-22 22:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 054776a603b18e6e35d943ac5ec04e84 SHA-1: d7348534d4c402cb7f53aa50111867b7231fec16 SHA-256: ffac2a013090f7629522634d5c2a55c2a35dec0bc06c5db076e57a6477a81ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://studioindelicato.com/userfiles/files/73809625261.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/baqd5d51qfq34q6cae09eo15es/13015291982.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/88629145827.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b6d8f05773115d28483baad7e430a09c/faxirokipivon.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rukuwodefajuwom.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/3378735896.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xabedir.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/18943201935.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/30756320236.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/luvobekuw.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/67092567741.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/xinonupetaxujuligakajafu.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/topofi.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/38324950999.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/79901746294.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d0180a57a---sedixutalizufodudigef.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/zesagejefivizi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191949426174.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ccbd90d7---34452125608.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/gusegipum.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/30180643419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=super+mario+64+jPDF 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_off000158b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B1 19432 bytes
SHA-256: d749d002ec2904b5e01eec281482abcea6330f5997913de82a1fd488245f16d2
font_01_sfnt_off00018be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE4 10548 bytes
SHA-256: a9a4ac5705bd5e5f863a36c02318306495c67e15600c944734a3c221022073d7
font_02_sfnt_off0001a3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1