Malicious PDF — malware analysis report

Static analysis result for SHA-256 51864ce2162e335d…

MALICIOUS

PDF

87.5 KB Created: 2021-08-06 19:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43bf5a92d5019b9025346bb60e030eb3 SHA-1: 743319f586f5acf58a2830f10b6992810759b39c SHA-256: 51864ce2162e335dafe7a10cab33781d3621dae602b1c137ea11d26019aa5464
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to external URLs, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mt-creativestudio.com/ckfinder/userfiles/files/tepavegile.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/42509415245.pdfIn PDF document text
    • https://majubesar.info/contents//files/50119295978.pdfIn PDF document text
    • http://sparkpro.lv/content/file/leraruseguva.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81f6aee04a640f7ff46af0fc66aabb7d/16501026927.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/pisifofosoluk.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ad7106c86bf71b049782f0e2e845bc1d/55844141923.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e687d848d2708246fd2e686e4d9c40d0/fisonemeruwuver.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/doretumexegog.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/48924789959.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/42244781965.pdfIn PDF document text
    • http://lachina.cn/upload/file/55132531326.pdfIn PDF document text
    • http://strandedtattoo.com/file/21975246258.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b1d38a44---wejuwororulofodiguw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jrm01r6qfrbbc99hkldu5ds177/79349437494.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/76792502250.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb65fc3fcd---lagosozonajafow.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/xivexose.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/mesasa.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30e02bb3fe151425e0c1ca08a442daa7/naxefesitivituzomimoralu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c40b1d4b6d06d24c013857080e72f92c/24745151688.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/75664166253.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1ad890b30---moluxukozomovupe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/981c83e0ae8fbb9216f8b454ba85d03e/28073210861.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/98282983967.pdfIn PDF document text
    • https://icbacademy.com/upload/files/39728583851.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/15755122907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tinder+gold+apk+mod+revdlPDF 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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 10592 bytes
SHA-256: 13676a62e51d084531aaf42cafd1274b87134ebf904bee87119928f2d4d800a8
font_01_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 16468 bytes
SHA-256: 8519e49b13aa5e57f988ce3bb43f4d179129166a90b6e53ac3638b321137d14c

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