Malicious PDF — malware analysis report

Static analysis result for SHA-256 932932cea706ab14…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 02:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ea6600ee038ffbdc4cc21cac072d9ea SHA-1: 342ac8da31827b38295bd1ecb5589c3adc983ca9 SHA-256: 932932cea706ab14e1837002bd8fba87a13cb2193c79d0205f0bfdee7d2c5a9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with several pointing to compromised WordPress uploads and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of these links suggests an attempt to redirect users to malicious sites, likely as part of a broader attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.mediagrand.hu/data/editorfile/80725303082.pdf In PDF document text
    • https://holcom-solar.com/webroot/img/files/40500500788.pdfIn PDF document text
    • http://artospace.com/pics/file/lowelimokabufepuvesa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813ec3c1c1---vapejusufusanupo.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/66139466480.pdfIn PDF document text
    • https://irantruck.ir/data/file/bexunuwonupifojilixuki.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2116d34faae9324ada255306f589a382/10114536887.pdfIn PDF document text
    • http://net-work.cz/data/file/jumopivuxokosovol.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/38088767813.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/41492661483.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/21628108348.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/duguvekubiju.pdfIn PDF document text
    • http://www.celso.org/download/kumukatis.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/16887616867.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/zivuserowolon.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/92487013697.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/roxijutug.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/lijomax.pdfIn PDF document text
    • http://ukrfirework.com/images/file/38711172687.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaa9bbda4---wipoxopaxodezos.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/96778743126.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c8f2f90c---puranoritewibulusexuni.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/buwesajafotisi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h5g670q6rng9n2j10vv6b4v9oo/deleruxugaka.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/napunus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=offline+hack+and+slash+rpg+androidPDF 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_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 18068 bytes
SHA-256: 5ef83d3fb418a434a855c287d2256cedbdc613256480ddb4b330b9076d35e450
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 10920 bytes
SHA-256: 747f51b065f630768f8f8d2896f9834f7c23862ebbb3ff9338140ad94b8d3409

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