Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5dc027b0b5ff0a…

MALICIOUS

PDF

94.5 KB Created: 2021-09-19 02:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55963da7cc49e107e332ce6655cb8ac2 SHA-1: 8f5f4a6d267351b15b3d72a56d864be0aeedab1c SHA-256: 2b5dc027b0b5ff0a2a62dbdc39d74e5e1e95deaae28e060582327e4c04a1b1dd
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised websites, designed to redirect users to other malicious or unknown URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.channeloflove.com/ckfinder/userfiles/files/72075214947.pdf In PDF document text
    • http://aquaclub.hu/userfiles/file/10500142475.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/bimirapumiduwubamoza.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095d929e22---42409543405.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/wivurilibem.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/22585419889.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210904_E4853B413CA8CABD.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/56637778478.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-17-20-52-58-92.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a5irp65vb943au8usir8mb4515/42292686012.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/71544911427.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/99947375106.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191615248.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/golovifipe.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/xagimibujemunur.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/nokuduwudafenoz.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908233155.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/gafopitobog.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/bulenubetawutapaxa.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/41561081188.pdfIn PDF document text
    • https://ferropula.hr/files/loxoferixojitupurelawoleb.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca76340b4---motoleli.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/bajefeduki.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/dufumepakuputekazige.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/lexaxarasiboriwaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=amazing+apps+for+androidPDF 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_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 10604 bytes
SHA-256: d0f7f652dfcd25910a53e9c9bfe2ed9e8ec05458e57849fab4822691cae91fb4
font_02_sfnt_off00013da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 18064 bytes
SHA-256: 6f2bc3daacda80062e998e7ea9ab40c0e0316fcb0be14060cd1702f0c52abef3