Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbc9b2b2c5fd591…

MALICIOUS

PDF

85.5 KB Created: 2021-10-04 18:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 013d81b11bc4d970f143cdb447e5999a SHA-1: 02a63d51843b0bf8cedb7daa885477f6241d5aef SHA-256: 7dbc9b2b2c5fd591708b785a5a994a7d5427a682a0578be1a46442f09689f6eb
156 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 or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 https://infrive.ru/uplcv?utm_term=cuphead+release+date PDF link annotation
    • http://seibyou-koujien.com/files/files/69560454568.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49755417212.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/kasoputaz.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/80564331219.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/58567871888.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/22960764620.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/tobigutawemipo.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/82061311982.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/20215962016.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gijajafafuratifekegev.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/lixuporajederudisu.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/zumege.pdfIn PDF document text
    • http://hingliltd.com/userfiles/59199946839.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/kovalojevelikekuwotiwe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9db6i07c2v4ue1k6hhsvpd2i3/gubaxoxuwudotupubapululi.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/dufiboxejekepep.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/73de51a3538f4c167a5a7b5bdf96e1e3/13254515974.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97c97849bc9a56d31ef5d6fe6f6c6895/16570797129.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gujibogifoxefokelul.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109032005302257.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/37316962359.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/sifugavuxenekedoditona.pdfIn PDF document text
    • http://immopolignano.lu/images/34953681746.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/tebodajiwakodatedigerazav.pdfIn PDF document text
    • https://elemonbg.com/Files/File/duwurenojorifut.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/65580793001.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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10304 bytes
SHA-256: 0fdb5869f02b2d72ed9584e6a12142735f3d8f27d52a4c4edf37c86441ba0851
font_02_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 18436 bytes
SHA-256: 5d336e9fe3e5e8d18d2d4b0d87c4d63d0b4b5efd57f7151079ef5c83d773f3c8