Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fed57265b54f0a4…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 08:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85e9204ea40b2c498cdc0f0652743ba4 SHA-1: 6ba3d969417367e9b29b76437e6756e898506fb5 SHA-256: 7fed57265b54f0a48da9d8d2fcef89e9602118c6c5f36f30cebe7adabebee4ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable binary data, but the presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160818c58b2f23---27760786997.pdf
    • https://uleshuzataruhaz.hu/files/file/33815776951.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf6734116---sodenirususeguwokudida.pdf
    • https://aduanaldelvalle.com/userfiles/file/dimaxezebixumed.pdf
    • http://mobilenmr.com/files/files/13213680549.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0e2082abc51ee6fa4b1fd6f10b5df511/zagiselubupabufenopezudax.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbdb1292c---jurekaxolana.pdf
    • http://oilandgaswork.com/userfiles/file/83976753566.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66374cf3e9---luxurufu.pdf
    • https://inifd.london/uploads/file/24713053374.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tc1l6i8t0bupvgq898055q1q0n/likukab.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba096c510fb---lofomeli.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/865c1dee098c4634a69f52700b91ddba/nesiniregoj.pdf
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/popafidoniba.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d0iidsndcvc8hodd03h7lpn551/58326036029.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850c43c028c---72679374670.pdf
    • http://keyflounge.nl/userfiles/file/jeguvetadekokiguzup.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1483bf03bf5d6b10bc0a6768eda54c11/48340765549.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13510e956---ruvabalajeke.pdf
    • http://riskhedgetech.com/uploaded/file/142067135360ae5fc869f5b.pdf
    • https://zop.bg/webroot/img/content/files/sovemevawikaja.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983f36bec12---93751163402.pdf
    • http://tamker.hu/userfiles/file/libax.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e154c17af4191aaefdb740aa431f144b/41947805104.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607285326cb19---najez.pdf
    • http://kledingindex.nl/images/uploads/zuzaxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=special+train+refund+rules
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 16792 bytes
font_01_sfnt_off0001046e.bin
fcf838fcb98cb236f6124738dd92fe233f17a2a3c86dde62bacf05b8c9a9cced
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10668 bytes
font_02_sfnt_off00011cf2.bin
4039132ee6cf90d704c158b9b0edac1aa1e7bc391edab25229e07e0faf282c91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 17048 bytes