Malicious PDF — malware analysis report

Static analysis result for SHA-256 db13c7a0c0de1189…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 21:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d995b159a9d0f7cfea370b8f238cba8 SHA-1: 6c12349aefda916a6714cd27a73cd01af94b1021 SHA-256: db13c7a0c0de118918572562fb3c123ee2cb6e40b91de2082ed29c2114c7ea9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with phishing lures and malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://oniceh.ru/uplcv?utm_term=anarchist+cookbook+pdf+download PDF link annotation
    • https://aczv.fr/userfiles/file/wosivetaxuv.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/70491801952.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/xasadenoveniwugogugisox.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/90887484397.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130645891f6f---jujulewo.pdfIn PDF document text
    • http://kbchina.de/upload/31188847775.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/mejesinujafevuvoluvimis.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/buzowabimuwim.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/57004068510.pdfIn PDF document text
    • http://falerisztika.hu/tmp/88794645435.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/79701951157.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/20906750047.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/soxuk.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/lipupi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dbeca3baf7e471a5db3462f388966c96/36243426188.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/33620674273.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/88671479911.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/61964972218.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/namesimobagavukop.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zedad.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308e92407c1---15323612625.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ba6443b6a3d4f143b0b97421be4ce81/29537295556.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/tudinowori.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6b7910c2c0d8e392156f2b56da9eec67/wonexilikani.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/63435135323.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/67235722602.pdfIn PDF document text
    • 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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 10884 bytes
SHA-256: ce201c44714c55c846310278a67fbd3c91de9aa3f45b41cf4d188a0359d17322
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 17116 bytes
SHA-256: 4d98bff742abf9fafc0bfbafc710ae604dc493bdd2738cd60dc5b86b2dd08ff2
font_02_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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