Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f56c14f649574d…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 20:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5c12574c819c6f65fe2ec421fe385de SHA-1: 20580a23cb9099f364b984fa8946fd6442c9e425 SHA-256: 68f56c14f649574da0809d41083cd5d2a3ffc2faceb9d3642b37571f62aff9a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://haiphongcontest.com/images/files/sijavitabodaleseru.pdf In PDF document text
    • http://songdolandmarkcity.com/userfiles/file/64629195704.pdfIn PDF document text
    • http://iphysiology.ru/upload/zenaxatinavosujavajikopig.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zalinokusubodalidozuv.pdfIn PDF document text
    • http://irollee.com/userfiles/file/titupat.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/rogimaz.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/69005488922.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/719ce398e6f06a033f9a952e91424376/85671109544.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/baziwu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/oa38pq5m5b58s2465korqecno5/66364254861.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151e932a8150---fofiwonugidibumeji.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zizefumizevefawu.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/25451170744.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/vosalimudoze.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/neremifutiloru.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/jawenakini.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210909002216.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/15107178213.pdfIn PDF document text
    • https://equalland.com/uploads/File/peniwimoxuzafodolalolip.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/66085390450.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/ruwinuzusuvupoloduxi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/vulenaduxajipezovog.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/9449198015.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147554f940ca---rewukes.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/15609842404.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/pixifikesoxexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ldplayer+for+free+firePDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 16612 bytes
SHA-256: 0eb881e30d00d478d5623de83906d8f6f54457e1732fdbd67fcd1d53f14c6201
font_02_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10192 bytes
SHA-256: 32daa2f142202d7806cf00a3e08df771083a3efe6f7c809bff5e610d73a67141