Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9edce772961f257…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 16:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 888030708f2920f62d9afede81e8a7d5 SHA-1: acab935b4406eca34477e5cf46a4e5d821163520 SHA-256: d9edce772961f257e0272d5ed5d1e8cac40c94d2c3859631eae80976076da87c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate it's a link farm on disposable hosting and that it's a compromised CMS upload. ClamAV detection and ML classification confirm its malicious nature, identifying it as Pdf.Phishing.Trojan. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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 https://pistant.ru/uplcv?utm_term=names+of+allah+99+pdf PDF link annotation
    • https://paklya.su/design/img/upload/file/muxikifimalun.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/85628345008.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210804195037_mwu7dw.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/tibupomemutukurixiker.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/repovokajubuxilarazom.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abb23c332fc---45420207520.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/9076766375.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6eb89856---98504785988.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7db890b7---feguraximifi.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/lujulenuwexixiwiwed.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/48886681063.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/7957971044.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/54581526804.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e2c10e96c---92759036468.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5243042d5fbda062c246df97f6ebef6c/natawifiwu.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/fasadidizerifesivevobuvil.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/o1bn67cq4rtuudo375jpjh7vku/mowamazelipagi.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/78281440034.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/75307949487.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/omemm1jt9ebpgsatdeenk4d0vd/dubitibudoberaziboda.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/kudozasewura.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/28342499585.pdfIn PDF document text
    • http://debten.net/UserFiles/File/zojesowenujulutoji.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/ronelifusupuxuwesaxat.pdfIn PDF document text
    • 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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 22048 bytes
SHA-256: 86d772b66029ded79fb023a4f60e20825074fed28e14929e593978a1da6cc7b5
font_01_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 10516 bytes
SHA-256: deef5d52272996dabaf66b6bee188b772ca6abc4ed0fbffa8994c48e9cbb2eb1
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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