Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbf91a1ae49c791…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 23:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03b3b451f0724ba6310ad9f603d5b840 SHA-1: 665dce9a3c06c815f059082c225399a99d658762 SHA-256: 0cbf91a1ae49c7919616f40a6f94f286671e8fc4ad5a007ed6176da93ad5f2c1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dfwsedan.com/nbloom/fckuploads/file/26167048677.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387b89180f8---96355376367.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/54768880890.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/kebafivufupubuwep.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/54720998790.pdfIn PDF document text
    • https://hiroyoung.com/data/files/56443386181.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rps8lj80cv62ht4l2bid1kg0e9/30498941881.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/nefogutijozuxerelevikodo.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/7857266611.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904230505601242.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/655444a5d65a022a8f8d75bb13cbcc44/liwajijesovejuzajefufesop.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/galabogemavaxufipifedi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16eb314ba4fa459f3c1287be13131971/21373119745.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/21978976636.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/lujekak.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/33393546177.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/papusidogopusulemar.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sogejisukezorukapo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vifizipob.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/wufaguf.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/5045269252.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/38914837491.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zaluwitebakepinuk.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/6026211832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=remove+app+from+my+apps+play+storePDF 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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 10548 bytes
SHA-256: a739f87d5cd297d3ea397fc08fb8ba15802a1210aa2df72fcb4205c470f0da41
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 18124 bytes
SHA-256: 40e52a13cfd30eb891f674332f498201623f14932aee1fe8c0284fa45ed93cee
font_02_sfnt_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1