Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26425d5a8e58800…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 16:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8078889731d72e01b62a55989a033fd1 SHA-1: 4144824088a385f358778f37aa5e6690895e8a15 SHA-256: b26425d5a8e58800fc2aad0fd29d1a8e281e64d2acf415e7a18cfb1f915bee01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely for SEO poisoning or to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=redmi+note+8+pro+has+amoled+display
    • https://www.jakketoes.be/ckfinder/userfiles/files/85253978423.pdf
    • http://curry-box-deluxe.de/userfiles/file/limedodu.pdf
    • http://stoka-saarlouis.de/userfiles/file/34994616615.pdf
    • http://mai-colle.jp/userfiles/file/rafugit.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/72804910661.pdf
    • https://ms02bet.net/contents/files/jogimamopug.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/46793329652.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/daxafebasapupifiden.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/88283575685.pdf
    • https://vargyasnekonyveles.hu/kepek/other/file/vewewutejotunopufudi.pdf
    • http://praguetransfer.com/files/file/zerosasiponediren.pdf
    • http://ltpbetel.ro/userfiles/file/81014039096.pdf
    • http://banglenhospital.com/UserFiles/File/7242784160.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gchn08qm0n3vbqoj3f9up99qu/kujoxad.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/vukagugaboged.pdf
    • http://thailaundry.com/imgUpload/files/rajufazalakogemebu.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/15843797224.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139abcc15784---21140285390.pdf
    • https://henseltech.cz/userfiles/file/63926685268.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302dfc06a5e---49961314500.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ep57k4vurs1gdks1f9d69h7ck0/peligapovivigipo.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d4c6821---13129192658.pdf
    • http://simoncaulkin.com/images/38268553345.pdf
    • http://www.perchegouet.com/ckfinder/userfiles/files/kakodipiwa.pdf
    • http://kamienneogrody.com/userfiles/file/84324932992.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 16792 bytes
font_01_sfnt_off000104bd.bin
7c314c2394f089f05993b7498de99489902962858bc87769e0b984c65154ed58
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 19000 bytes
font_02_sfnt_off00013701.bin
5ea76eb9a749a2c3c808083c76f09d130032a0b094bd4df0d33f8626ce5adaa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 11024 bytes