Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2ac89aad1cda7b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 07:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6741bb42549ac436f9875130f339662e SHA-1: 9095ba99bc147de17c13d887b4112544cf3f33c1 SHA-256: cd2ac89aad1cda7b76d1add27a2f02462e6ff0aa52feabb6e55944124d2bd91a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://texinpack.com/uploadfile/file///2021090514481283.pdf In PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gedorilurofefixorivuzuf.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/vokari.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/90661321577.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/30725894303.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fb5ec86db727ec230a24c59b02556e0a/36071088590.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614018a3b9f89---filasugawuzejirojejipigif.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/70760186722.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/35690008019.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/44810327058.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d84e651bb0bc08a00167a02f1afc6fa7/85402661021.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/tixutagurapebuno.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/romugivovutokosav.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/pezuz.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zukobi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b100e74003---zopamojuvula.pdfIn PDF document text
    • http://herve-coiffure.ci/files/52143676448.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/90380147103.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/prva1glr2ftt7jsb7850dhicu5/42291546125.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/85532078203.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/84984331720.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/79817434350.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/302238858.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kivowolaxakebupigosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+screen+mirror+in+mi+phonePDF 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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 17572 bytes
SHA-256: 1bc43befed001cf6a66471e72240ddf636dd2d8610fe0f76d0fd778c455e1b54
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 10508 bytes
SHA-256: 3e6f3069a9c30043017a5c05cdf36dd706d1a09ff201739cf62acaae38ade97c