Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa727cc7c524cd85…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 00:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ab7f893b0f3eb7723187fd756116a25 SHA-1: 7acf70547f4ebede2597324f6c2b233ad27e4a1c SHA-256: aa727cc7c524cd8555d9277ee2a9b3b50ececc6c62e001f44aa1beba97ad9e75
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a ClickFix social engineering attack. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the heuristics indicate a social engineering pretext to trick users into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://kiptep.ru/file/48101838126.pdf In PDF document text
    • http://chi-kara.net/userfiles/file/visakojazak.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131fab96cba5---ridor.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jebodul.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/pobilewi.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/wikukesinekunenupuzuxo.pdfIn PDF document text
    • http://salwex.hu/file/24307937512.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f093ec86---mowufefemuxinedifata.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/79582000176.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/lojukomuloravisapagizes.pdfIn PDF document text
    • http://7profi.net/userfiles/file/jurikibupodomoxa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/080bb1c0cf663dfb9ec4a635d3a53124/94260644676.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/62819853479.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/56129633699.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/botisenebigufasuv.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/69639022708.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/rusokebanadid.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/xujafonaferijatexigusaw.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/18591989992.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/puviparodotasekozudujit.pdfIn PDF document text
    • https://aokman-drive.com/d/files/gisuviveguxinapa.pdfIn PDF document text
    • http://halaljones.com/uploads/files/95780128425.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/48106090903.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/36387065339.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/66862891469.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/milup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+merubah+vpn+hp+androidPDF 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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 10684 bytes
SHA-256: 52c0e9331742c23d7328728c29be82cd6526e97632dc5ac23076fd3120241faf
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 17544 bytes
SHA-256: 255ad4ad7e6a67a401a71f0edc9cf12ce1dc1d42261b9bad81e722cec5e7baec
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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