Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef44a09182ed00f1…

MALICIOUS

PDF

87.8 KB Created: 2021-10-05 03:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c09ab044b0e4b3c03aa548085cc00014 SHA-1: 582824b8e7e90a29bb24e95729ae88ca216a2dcd SHA-256: ef44a09182ed00f1e9ec9fcf85120a6c76c9ecbc9ccafbe167a6c1b4e05e3ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=chapter+5+skills+practice+answers PDF link annotation
    • http://toroisg.com/public/images/files/varamelatadarewimekixef.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/galunuvanif.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/63163310783.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/63228881382.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438cc982c8---gasogudikelumopoxof.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/52806245897.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141082d81913---52986133778.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/gozodidalazura.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/8226707699.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/66627337089.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/puburab.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210914050609_nfkyb4.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/11766908355.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b75dc2086---fumilutizarewizi.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/potiga.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/20762302757.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/jejuvezoko.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/lupujomolovokijovejedona.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/18336963618.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202110031011143448.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615711b1368d8---59999830389.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/xilovuzubikagovuzawavanip.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/mevasapejokunujuludowiduv.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/82885634625.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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10692 bytes
SHA-256: d2e6412a3d116dfe62540e01a280e22dd02138c3b2fedb0992dea1d485df9f26
font_01_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 18744 bytes
SHA-256: 322a2ba57ab9569ddb2d2fa582d77502402851c9ad348b47dee5def7f3772ccb
font_02_sfnt_off0001393a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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