Malicious PDF — malware analysis report

Static analysis result for SHA-256 4103898f4bb777e4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 15:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85e6d4e79e92042ae45c935e662d11ef SHA-1: 5518fb6f828edb3aa6d3cd365a829f088b152230 SHA-256: 4103898f4bb777e42e9c4e902c70560b98be824b2abbecbc1ab32215630513de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=font+changer+no+root+apk PDF link annotation
    • http://pataibicaj.hu/userfiles/file/renowebinofuxewegujepe.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/wufurodubugunebixururavi.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/41093624549.pdfIn PDF document text
    • http://na3.it/misc/file/remumovubituxerosulodefov.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b30df0c0a7---78798058692.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/wadureluzo.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/fimosutumixexinij.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/83cdklgmppel9mnt9s5jpsp6h5/nelowozulafifatezarokibaw.pdfIn PDF document text
    • http://qdjshg.com/files/file/13602943124.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/18944137522.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/vewutal.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/majipobabevuditi.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xemojiwirubefijesejajofin.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/gadilezaj.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8c2f8e5fd0e0891d9187a5cce8356d0d/16409143523.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/24830337831.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/rokagoboze.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/92317202321.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/fogokegumejaluvibaf.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69924823638.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76cf0c32d6bc44961365830dac7463d1/lexofijubusedozepiz.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631612515.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_off0000b2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 18184 bytes
SHA-256: 4b933fa45201907861a16a16ae77d87b1002ff3229d0ad5108e203a0631951bd
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10416 bytes
SHA-256: a287b079d5e6afcb9fa4c9f6fb12cec536cecac954a6659ab6f2cca91b102780

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