Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c38dc093c5b019…

MALICIOUS

PDF

93.7 KB Created: 2021-07-13 15:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58319236ef725ac2de5a056d32d2eaf9 SHA-1: 744d0d04672b61b6f1949f501a4131423d18e1f2 SHA-256: f4c38dc093c5b01993c523812cf9af2a1e7387c7496d0077ce1bc071b7c208e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=what%27s+the+chances+of+getting+pregnant+from+precum+while+on+birth+control PDF link annotation
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/91898451654.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/573ee6c6b6f67a3f7db8d1d6a580d827/6654788071.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/futiz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/59655039216.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507065025846175.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/42028929346.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c4ae2ec030c7117354de48f63af861fc/39595889166.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/semom.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/97f749cb2ec52ba755652533b4d17742/fuzividu.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/golatakutezinikavin.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5c23bc55701fd2ac948e2dd26085ee5e/6815592510.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c8ae21a8f15391aad592c39a6994dfd8/58672953538.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/iecane2agi0eh5u2gpk9lbtj1n/61349125462.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3af018a3---besibefiworipatudapepedag.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lifido.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/10998683176.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a4aaf8f5c52549236b572ec8cecba332/88866872578.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vi7ss1tche4ba87aukkot2cpuf/lipomigerukiwunubafaxego.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40499444845.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/funk9g2rignkftvblseq7pgs4g/pizekabemajaku.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/57f1f04b264b8d9608edb73d56b8c8a2/91508621300.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b46ecbf5---fetezasegenavobap.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/86200491175.pdfIn PDF document text
    • http://poorclarescork.ie/images/jirizogoju.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ee88614e517d865326ee9dd2d9d906f2/sutefiwimidovavogosaxipo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 11280 bytes
SHA-256: 113ca5a849b573ac5bbe08203bbde6e78dda6c4d019f6575c121532ee9804378
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16396 bytes
SHA-256: 0d5ffd35431de3a46edebb3e7d04db42186100d4a60b404ad8ca180934dad6cb
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4D 17068 bytes
SHA-256: f8f3bc6e733b022f7d78b69f849bbf7e944f4e099945b97234bd88eb0493c5dc