Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd51f7cf1956c0a0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 19:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20bbebb03339de4fcbc3d2688b5e3ac7 SHA-1: 60b55019f30c3d34b0bb351c8d88320e6ca633ea SHA-256: bd51f7cf1956c0a0dd7e541166b1f46783a45b56206285151d52a995e43ab44c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with multiple URLs pointing to various domains, suggesting an attempt to distribute malicious content or phish users. The presence of compromised CMS upload links further supports the malicious intent.

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://mitroc.com/userfiles/file/20355723697.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/91422602137.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/87651601768.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0490fc92---12369565659.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d6f6405d---lunonisiruweru.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/84112307546.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/buwumu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/sejameturiboxe.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/25828173881.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/dugijosogotuxudojutij.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2usii6udgp87t8pj7mekk955sq/kagiwinizeg.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/91582268139.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136521d6424d---suzalozotewewamez.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/80339114008.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/kovod.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/foges.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210901233552_967840933.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/gizivemetetozuvekex.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/gipakug.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/ganizotifew.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/87946746599.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210903235204.pdfIn PDF document text
    • https://ekransamara.ru/files/siporogozevakovusigom.pdfIn PDF document text
    • https://mattress-leader.com/media/pijelurunizatulezojutu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85646618e---jaxugekatog.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fck5s8kt93fso1vqmmgmf4590t/wugir.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/muxosabefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mi+note+5+pro+latest+update+versionPDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 20752 bytes
SHA-256: 0895801ae85541b35e505c060545a5a8cff4d638dca2ec11dd236e002a78d756
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 10676 bytes
SHA-256: 5be955baffae3de4642e2491fca35a3bbc5366c1952a25ffc525503ae523832e
font_02_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1