Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaab626dc2581be…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 02:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbf445935acb797fa84815767de62abd SHA-1: 38f56958a74d59c81deda18b7b17750b5f5ccf75 SHA-256: cfaab626dc2581be44c79542329ba9eedddf5790ec7698447971639bf69c8e33
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple PDF files hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://ash-graphy.com/userfiles/file/vivokedubojodes.pdf In PDF document text
    • https://koratspring.com/upload/file/xuxeso.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1f9e53f2---93151805807.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/timolusoviselevodilunanad.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2c00a5f1---dobawexog.pdfIn PDF document text
    • http://aimic.com/userfiles/file/52513624095.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/30169202029.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/112298dfdf162a5be8cd701580431859/76342949115.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613283455b6a9.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/tebasuk.pdfIn PDF document text
    • https://chp-travel.ir/data/file/51755594064.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/wovuzusofowokubogifomu.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/netojibitomev.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/17021646492.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/90e0852b6132ce0356bf3a6198015a58/jixunusoxekovupubaka.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fdabb2dfc3e1fe77045dcb57e7cf3060/58239237613.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3ecf7687916d6cd7391f89c4301afb19/55260995301.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/72705840657.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/43113212876.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/58483703709.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b40f2de8a7---59029097732.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a81b0c317938eebc1904a6d144f14496/zezojujidijojipowawow.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/27937659010.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14121fa75---30747705794.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/fabevovuxage.pdfIn PDF document text
    • http://jarosi.hu/files/file/kixodaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=think+and+grow+rich+quotes+pdfPDF 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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 19096 bytes
SHA-256: e9c407eade80792ae1b583ef84050f038cda24dda8b56af3f75992ebc6e50114
font_01_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11240 bytes
SHA-256: 29d478a16655fa2e4bc44a539a1e905791e53a0632b818c27f47d69590b22df7
font_02_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1