Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39d227774ddc1c7…

MALICIOUS

PDF

106.7 KB Created: 2021-09-01 02:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ffbf53182f2ad64710863e1795e6c4a SHA-1: 11c4ea48725864bf80dc00be2dbb186ea4c3d795 SHA-256: f39d227774ddc1c76aaf900b7a1ce19ffcebb2071ac7bf197b0ceaac4c045b4c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. These links likely serve as lures to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd1cb3bfc---leziwelodekupesej.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fe9b9ce4e---59960080207.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hi1ep22499brablksgq2qkv71e/todipusibanozolomalaf.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/88299883740.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0f3e1501e54200b3c3c33c7e01f4e2fa/wilusisopuxexebireg.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/aid0h7jnt9basq3pbc0d3hpf10/16477516236.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/nasubixerafijuruzapigare.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3919280c44---48364723063.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/76568409367.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51144630401.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5ee169fcdbc4e143777968bd832771fa/82664152847.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1m40stuleaul910gf6leb5b1a6/gufofiwumel.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/kuloneparisiten.pdfIn PDF document text
    • http://www.puhito.hu/uploads/vixezusigiderabefo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1edc7f51c508e11caedfb98c39dfa8e1/43476088065.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/jopitoxoxewonuregixis.pdfIn PDF document text
    • http://weingut-suppan.at/files/60067723801.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/xagusekixuzavadofuka.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/takofogumurosa.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/vuxubob.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/83456322494.pdfIn PDF document text
    • http://sowitech.vn/upload/files/teviwowofaxujukezixomuwu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/14768403459.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/loziterowaxuz.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/degatavusanunosiluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=central+to+hung+hom+ferryPDF 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_off00013795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA7 19980 bytes
SHA-256: cc2f2670c4e024c64766267a2a6732921cfe629f5ca08d07eb71099fbe389661
font_02_sfnt_off000184af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184AF 10648 bytes
SHA-256: 91f4e9f8ab6cf12cfa95519fc18ddf6df39eab04c08d7bc9dfe55ab4b0971b8f

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