Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff2c9a12c3757a0…

MALICIOUS

PDF

70.4 KB Created: 2021-10-06 01:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c715ca77fb7f513f12980cb3e0566b2e SHA-1: e2dd5b8bf0ce39d4b5da5ea5dfa54f8326829dc0 SHA-256: 7ff2c9a12c3757a0b3d945f2f892a43973fd9753006708c91590318d02e89c41
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=town+hall+10+war+base+link PDF link annotation
    • http://csc0532.com/userfiles/file/20210916021303_x4yhae.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/04d79f4a82aa93290f949275d2934d1a/58785185861.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/dogiwevavisudujuvupe.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/92727489758.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/6815490066.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/bakutoponet.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dibativogurik.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/tokavowap.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210914000147.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/borererezewajojoxokoguri.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/kevepakozosimer.pdfIn PDF document text
    • http://geodez.com/pliki/file/2429761797.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/bufalifanumipoxagal.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/wokagupogek.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wifev.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/2439551760.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210916215646.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cb75c241720179d9b0449251f07ab74d/45003722000.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/74219450131.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7857cfe864b59901db7c0cc668330c86/bixogugitanaxiwini.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vavozizupif.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/fibefujowikikog.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/97316177397.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/15426034234.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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 16048 bytes
SHA-256: 071a8501fe2b5db35085bdd700b79c11cac692eb1e834516f3fb9cc2c86078d8
font_01_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 10560 bytes
SHA-256: fe2047da217f7c62e039d95f7ab447bdac8060b2675d7c976e6b2124b6e71542
font_02_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1