Malicious PDF — malware analysis report

Static analysis result for SHA-256 144cac57455c608a…

MALICIOUS

PDF

75.7 KB Created: 2021-08-15 04:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 89f491fec5786678ad03e940bd7778a2 SHA-1: 0549920579ce754ea5728e0bfbd2c4a884a2d3c3 SHA-256: 144cac57455c608ae59a664e89d568ce6f022ea25153be9d8f65e907af2278c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to download other PDFs from compromised WordPress upload directories. The embedded URLs suggest a tactic to distribute further malicious content, likely to trick users into believing they are downloading legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99382bd704---lagedoju.pdf In PDF document text
    • http://telekommarketing.com/firme_data/files/vemifoguzuzupenafuvo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcb55bc15b---4745513254.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/sabodevewetigeneki.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/13428848093.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166a90e6603---14532818740.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/37s2g7gsgvkmdaqvv3m178f2jt/20490863986.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609278f198195---98821429297.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7aa1bed7---perora.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84893442064.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6e1ad288b27bcef29602f58e97922924/kajubosus.pdfIn PDF document text
    • http://candientushinko.com/images/file/37513529710.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/26265251562.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/74989919391.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57735965131.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b83f5553e0f---dumixinujesapizaxizi.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jadepejewuponip.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78d4b5df6---9817668885.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/63899585086.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/100895146160c888a20ec11.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/15826289404.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4581864056---fenexuwofamurigulis.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/74533869906.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/af790528d854612fecfa2ee0c109300d/vejiwapopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solid+state+physics+book+pdf+so+pillaiPDF 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_off0000c4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 10936 bytes
SHA-256: 5d0a4c25be0cd9ebf07037cbe89e34aa48bddbe4f62b89df6bc678b703a4c1cc
font_02_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16304 bytes
SHA-256: 8d19d740e8d0d53ee5055ab459c6cc57a1464687ecde1255d16441bcdb7bf695

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