Malicious PDF — malware analysis report

Static analysis result for SHA-256 c038698dd9482a44…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 01:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6e5c4162ce37ff2d538587b355065706 SHA-1: ff13cd068a2c494c69e8b55ae7c6e91ac833376a SHA-256: c038698dd9482a444a68c91ad46336fe82beffeeb8933b1859b242dc4a079e71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including those pointing to compromised WordPress uploads and link farms on disposable hosting, suggests a phishing or malware distribution campaign. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing further supports the malicious nature by indicating suspicious command-like sequences within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://laborke.ru/uplcv?utm_term=redmi+note+7+otg+support PDF link annotation
    • http://ifaistos.reality.gr/~triantaf/images/file/7405830475.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/78478376044.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/gokazimefoweg.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/gidolidosuxubegoxivufunu.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/43486301505.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210907084924423934t1g3h.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f269836---nanutadupaloroxogo.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/kunita.pdfIn PDF document text
    • http://reichspfarrer.sk/file/26585640623.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/11087429862.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109051705065508.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/muwetebufexenurapamido.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/80696476727.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/mivedafakedupofujaz.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e4ed13c48ede0077385224bf1ed6dc64/koduwitawiko.pdfIn PDF document text
    • https://pepsima.biz/files/file/tojowife.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/58909733992.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365a0d2db5c---zaredof.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/87528663323.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/xixuku.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d0405b0d---76917155681.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/toxufa.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3svtfqspbec2bhkq4e18ttcmdo/11213711863.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/lotev.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/kelufupizuzofozudiko.pdfIn macro / runtime command snippet
    • http://faizleathergloves.com/userfiles/files/ramewif.pdfIn macro / runtime command snippet
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143e28cd42c7---xelunuw.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/loIn macro / runtime command snippet
    • 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_off0000c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 17228 bytes
SHA-256: 72e4a07052579967d993c239e4a6dbfb4d9b5400fdc4ea0f5e72fecc59763a79
font_02_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10724 bytes
SHA-256: b5143d0099c674cefbc66ae6317896cda0f53d61662fe40505aace630f61cdc0

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