Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0cf77e7f4568f8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-17 19:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd6ce9accf01b2f2ea42e80e22bae64b SHA-1: 772c379085b6703030510765a2a2c8bf3a78691f SHA-256: 2c0cf77e7f4568f82e61331d7f2c3f1ed7519e785e490c315cea938a4d2a1653
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=inshot+app+without+watermark+download PDF link annotation
    • http://rymwid-training.com/userfiles/file/29743231698.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/xakikikazejow.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/35158706145.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/niketusugoxat.pdfIn PDF document text
    • http://rideco.hu/upload/file/jawivo.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/90433457174.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mupodotufuxivuxu.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kafipojawamugabuforexe.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/subivoximoviridofekat.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/26418480479.pdfIn PDF document text
    • http://weldingplaza.com/files/file/sozogurakawikul.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/12775924284.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/59963256951.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/68296236301.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijepotuna.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/xubiluwoxuvigonamofi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dce4aa0b---51916299063.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/2001174559.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c3e94a9f922f475423451cc0d11ff4e/62871017098.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/76363934539.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c5602513---80358374168.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/woxujuf.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4d543013---rebivofibenug.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/82251025006.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_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 14408 bytes
SHA-256: 9adde00d189f55254d129e7bedf8eb9ec4f5ad4e89d3d2ae6920b29d3eb31d02
font_01_sfnt_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 10884 bytes
SHA-256: cefeed59fd673b8d2cc082fe0b7d442f4957053991ac67b9738178416638ae0a
font_02_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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