Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5829e0347fed16…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 10:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95c8abfe8ce21574a3198e3fbf8ab66d SHA-1: 6e3e210ea50379acbdf89cdcb46a00ce5b62ce9d SHA-256: cf5829e0347fed161524a1baf3403ee4340bd0eb5bb4ae2aa30971fbaffcff26
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inter-travel.hu/_user/file/wedape.pdf In PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/87437675415.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/99690798359.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/33013023341.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zabut.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/sixoxuxomejujosukejodo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6bce20110110e985b186e1ab6a092315/29427097399.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab3d5e11---xebuvizavujuvimoxax.pdfIn PDF document text
    • https://digireg.lu/upload/1238312376.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac410c9e015---jukokifoj.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/53d84f254f9bd21468691c9687a0a986/giwuzaropasarajuru.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/ximujimu.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6c1eab3421401cf0d5c177c84ff2c5ac/mumexerejetu.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/reludagekibom.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb95281651---90330223427.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/tagasulelojekepeli.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/55059255032.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/199791c290304ef6272a47322c184997/48000095650.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/nepozagawujoxopugi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/u9cr9uig21a5t8o8va624tbhj6/bupunusitubivoferofomam.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jinew.pdfIn PDF document text
    • http://distributoram.com/files/file/43481256257.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mapusugidaxeserarefuvu.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/10361777729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manual+photography+guidePDF 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_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 18688 bytes
SHA-256: f2a1ea9a45a9197d63df9321f159033811f3021499d95ff040b10c4ad2b3fe5c
font_01_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474F 10708 bytes
SHA-256: d281c87c0125de296db0d10d6162f5020216a238922763e684bc1e18d96a0f2a