Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec27d9a8a39120c6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 05:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 996a655ec8d79f97b69ebe0fd712d2e4 SHA-1: 48f8ce463b2597a29a1d09172b95f74767bee964 SHA-256: ec27d9a8a39120c6444d65bb579237c482eea9037b1b3d510d3b5e87e659ae9f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload storage. The primary purpose appears to be directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adbuilder.at/ckfinder/userfiles/files/38280964392.pdf In PDF document text
    • http://vibrator4you.cz/UserFiles/File/juduxujuvonubopi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/389rj5snci9hq2a2uo43kv740s/58185008248.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090915291573499.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/41933547770.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45782816306.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/zepajubixonesobunatonakak.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/32923412024.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/3683707739.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nixuzuli.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd9a10746---lamidategikesusamutux.pdfIn PDF document text
    • https://phm.vn/upload/files/70156404283.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/68261411117.pdfIn PDF document text
    • http://domplus.su/userfiles/files/dewodexamemaxewikewiriler.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210913201133720.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469b7fab5a3---19192616695.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/50587302643.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69591610117.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/32711971887.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/85973192086.pdfIn PDF document text
    • http://lblussana.it/images/file/38313943248.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210911153721.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/98465510120.pdfIn PDF document text
    • https://cathita.vn/upload/files/21663695080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kotor+best+jedi+classPDF 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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 17816 bytes
SHA-256: 863f4fb85fda5d5f7108440e6aa310172d4d9294c53930afd7769b253a54d7a4
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10520 bytes
SHA-256: a06bd7867323a21d0c605c8a4ffffc0e4028970f3a0b1539295f3f5a805cf3e5
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1