Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e2a3b169d55922…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 00:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4dbe2edf90e13b5b144db9ac0a4abfa SHA-1: a184dc2a4d5415a08fd4a11ab072fdc35c70ba0a SHA-256: c3e2a3b169d55922cf69f9ae231f371b949ee5ae96298788ff218f2c895554d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bsp-oblspl.org/ckfinder/userfiles/files/lodobokolatiwupowo.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/772b6aa25e81a7ef09fe4cb4af2744ba/95161852271.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/fenukamus.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/21575391818.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2fa49e18---10336080297.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac86ecc8b---dokaboxugivisefulebibe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbd23045e---34866303204.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/475otimihhs7g0j4tuhqvnhasu/pukenagew.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8a36c1151279edc403e1964011bd5ead/4036660310.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216182327591223.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/41438658005.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d56fa4849b83d6c2e7333e1f7df6431/ninasizilunojizedalameb.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pobomomugekigenerebe.pdfIn PDF document text
    • https://questyme.com/userfiles/file/botifa.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/vetumuposapaxo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e99955e3a3128a556100892c0a8a47e9/jisogujiza.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/18636683751.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/vewofumakodafibip.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/11996464796.pdfIn PDF document text
    • https://go2germany.ru/files/file/wugugujajesizu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/885dd6503de2ae50bac965bc88efb311/wuwegorizajigubur.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fa6cf686---15601058870.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/49af2adb8d5ff6bc91bd505f943ad437/dudazisuzovubasaladelij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bk+precision+1688b+programming+manualPDF 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_off0000bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 18072 bytes
SHA-256: 0a92c402f5fe0bfe958d67d16efc0aca886b9ff4a1d770af2f553a8a0c8b9640
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 11432 bytes
SHA-256: 0db69ca06e45c9649059a59a10d1b75c8be9183a578b7e7eb0d831166401a572

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