Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2bb91cd961da3e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 19:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a0410514823f45fb957ecf2810e8155 SHA-1: 27e4ff1d1674b67489c8ec248ef621b778a07762 SHA-256: 9d2bb91cd961da3ea8e97df2a771ec952266ee921374d5a71e5a7d78c7dea6e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=granulomatous+cheilitis+pdf PDF link annotation
    • https://hoavily.com/uploads/files/38282862037.pdfIn PDF document text
    • http://esistore.de/userfiles/file/fakedanifemati.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cc9a90ca8da8f718c70027b1e045009/satodugubosijirexid.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/95260139751.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/bexodexoviminonugis.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s28r3n1ecomv19qvgb9toidk1r/65106352988.pdfIn PDF document text
    • http://cissi.it/userfiles/files/60122575578.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/ledejafimok.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609052a8f12c1---vafoxuzav.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/vipibatupafadesefuve.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/daferujaf.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/89561365533.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be530fc7b86---67685539900.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608452a9a4997---povuriwobelasewulesadatox.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/raloxewulagugita.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/43505674836.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8846626e7f4981d55a98df47e2c2f82b/99783003378.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/80241101787.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986fdd47e79---97477012359.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202108280253467031.pdfIn PDF document text
    • http://nova-auto.com/upload/76696701477.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856dd2dd047---5105274910.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf2c12c76---fugozuvotujubiboj.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ca4bbe930302cf262b53712fe5d1c65c/7523841106.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/vatot.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 11024 bytes
SHA-256: a4ea6a86cb31f2a2fb9e0779937135f2d14f2fb6742658467bd150282d80a5bc
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 17444 bytes
SHA-256: 5cd53bc0e260f9eff34e8c00dc34d8f2b2852f3ee4deb90ffb7884feca53274a
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1