Malicious PDF — malware analysis report

Static analysis result for SHA-256 b828331090bf3f99…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 16:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d8ed479262213312c5c2ce305c025a6 SHA-1: edb6e9915f6e74b9214ff13ef290671fb5e961d8 SHA-256: b828331090bf3f995498d0855e1dc37c30fa5bb6f222d784a73709f023020837
216 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to solicit sensitive information like private keys or backup codes, a common tactic in credential harvesting. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crysiq.ru/uplcv?utm_term=lexis+audio+editor+full+version+free+download PDF link annotation
    • http://boki.hu/editor_up/56349026343.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/fuvataze.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/jazugofi.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zowezuwenajitokugaxijesa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/16828413892.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/subunopepafakugizunuguta.pdfIn PDF document text
    • http://samtle.net/ckupload/files/pupasozazakimer.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/tutot.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/26588653610.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a4f58c9c---23111839323.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161376091e4a18---tisobikupakarerobat.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b2ead62104c6ea8b7f107b2d535cd9c0/52834647698.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/43773682852.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/metijavutakesokinizenufa.pdfIn PDF document text
    • https://blv.by/upload/editor/files/61273120617.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/80398834595.pdfIn PDF document text
    • http://prmakeup.com/Image/files/zodolev.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/tevewulepi.pdfIn PDF document text
    • http://juha.be/_files/file/52452454099.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/sufubisisuzilodiki.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/92617014865.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904020753.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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10660 bytes
SHA-256: d2c29d624affc0d0bc031377f4648062117366221b9c20f91c8caf46dd713f32
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 18228 bytes
SHA-256: 946891089450d96df0d0b1ed2a31ebbe3f4de007ea116b7825cb38548640335a

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