Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d038826aee620d3…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 23:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e04b0b09bda33b71a673f044646bfe86 SHA-1: 2a3ad6e83fd214adfd8cd20322d9640436c1fadd SHA-256: 5d038826aee620d386f4f7d91f5234d378402421c908d652066ed8bf1a3a2a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. The presence of these links suggests an attempt to direct users to download further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://zjhywt.com/images/upload/File/lokuparaxad.pdf In PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/zejowinoka.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161384ef4c1a54---fanusiruvofem.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/87160657485.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ccafcc271---65293950098.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a033552a---liwok.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/96921174450.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/dfb6771666604ddc7292ff7454787d18/xilalosoxojuxelubopude.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/43242757916.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/nogemolulovolifixojediw.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/mimexuwasijobopi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/967e4f87b85b2d2306ac38ed7d792c98/bufunakepemusujawe.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/65766380652.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109092332231367.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/37550737684.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/79698822919.pdfIn PDF document text
    • http://expresskaliski.info/file/lokoriluxizexa.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/sokenadejifubanujejutonin.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161434ccbebe91---xobalowija.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/52814067432.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gdulb0ada1vg6oeql73abmnv7s/fixugumepexupiwuju.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/wesogoxepawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=marvel+game+mod+apkPDF 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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 17876 bytes
SHA-256: 21f74ace3520659f2c1f4d15afd42ee0e799ec0e182f12bdf114d622b2834b26
font_01_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 10424 bytes
SHA-256: 839239ab1a2803028760101dbb26c3fd6631ef817525d10d812cdc9b961476e5
font_02_sfnt_off00013819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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