Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bed53c5078906bb…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 13:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13c253e7c6491dd91a81a413811cbee4 SHA-1: 6223af92777489637cf308e9b070f6bac0b0675a SHA-256: 1bed53c5078906bbe47ac36701ad736ff30d83735b131b3b00753ddd33b67491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed for phishing or malware distribution. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://titadoorbinhduong.com/upload/files/dojafuvojotumejitukagepu.pdf In PDF document text
    • https://istanajp.com/contents/files/34620331563.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/42686904234.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/96520835189.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7af41c06a2dd3309401535ed125a8710/midibixudanejuvupiwero.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/batopu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/48869686419.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/podixejegomegamunab.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/52746078796.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/wuponirarufof.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/aad6a3b4aee294d66f13543e0e1f71ae/fudavifirulobireti.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/43322382365.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/kodupolajogasawobuz.pdfIn PDF document text
    • https://lasanisports.com/files/51516214467.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/buririzewalobi.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/51000982253.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/fekuxom.pdfIn PDF document text
    • https://lorus.rs/files/69299005504.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/040gfl9mcgh7q3n36f5ep0a8i2/60261967765.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/88473767883.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/292nmh73k2rg8t3scqrq3ijqll/pulugafujima.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210911_6AF5EBC1BA26B92C.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/35987463847.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/98438751990.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sefogezujefugosu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xofupakusotez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apple+tv+on+android+phonePDF 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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10368 bytes
SHA-256: 7359dc3da19986de09ad435683dfb37e1ef166d0adcad5f7220ce7e9c523d279
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 17956 bytes
SHA-256: 8cd79402165bb001b9f79b1db110b3cf813ac2097347344eb4d935caade3c841
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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