Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5736612cecac5e1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 13:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c51caa99a8dad6a695fc82512a16c3e SHA-1: 55567681e7f4333f552ef0162cf7345f6e47ff4a SHA-256: f5736612cecac5e1115670ad149c4f2b326c8350f114cc856df2d329fcc835eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to compromised WordPress sites, with one URL specifically mentioning 'office document reader apk', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing attack aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=office+document+reader+apk PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbc8ebfca---21205651138.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/79993561412.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9572fb2a---kimewefitotunotigomotupa.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/gamazesinage.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/gukajulinab.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/88109945458.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/16926395291.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/5635156293.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/zinifu.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/34246339356.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/xiwivifafu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kavuwilukedixakijixe.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/93949487734.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/21480537259.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75674203351.pdfIn PDF document text
    • https://laser123.com/geektic/files/48674898824.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/falefopidupen.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ce1b647b---99636875871.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/pilebubakivogubewuf.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/jibovuwazexemosaratum.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/barenofenuravapuvo.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210903040308.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/limikafanamiza.pdfIn PDF document text
    • http://vlajamo.cz/images/file/90615510610.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_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 17836 bytes
SHA-256: bfef39f0d4b1d9346a9bf899f257e032f4b997157321f7907325361004b211df
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 10784 bytes
SHA-256: f1bd7e658f90fc13b43251754c900a062c685c6813e03be8e336dc74c0476625

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