Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c182093deb2abb…

MALICIOUS

PDF

117.3 KB Created: 2021-07-02 01:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ed3e843a8a638238a8913cc8fe48076 SHA-1: a987af2f6aee364ddbe3fca202f1664b66349f90 SHA-256: 05c182093deb2abb8456a3b2f4bf1b37196bd67c38505b6e06e100d9e524a063
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8d86faaa---91544854741.pdf In PDF document text
    • http://madmojo.com/fckupload/file/30464388828.pdfIn PDF document text
    • https://tavio.ru/files/file/31082197207.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/87628206400.pdfIn PDF document text
    • https://promise-land.com/upload/file/guwavumavofesosovegagu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d8b6e705cea6c97a3e22206c53395392/kememuxafutewajiw.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ba96a1158a6ff008e58cb015051dd3cb/kedelasojixogojo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/liv1npdg2atug7gjlfkgnev0qu/48880002202.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/netog.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/nazizojiraf.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/zasudolixopiwavajego.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf1426462---1669372967.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/8708734133.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/84652b2c5e920eb67015610ebb0bf2f8/nikaligotosoke.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/6209685157.pdfIn PDF document text
    • http://119pump.net/d/files/kunadafiwu.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/gomewovinom.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mkj1bi24nn5hr05u16q2e8jkme/59798806006.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27b673dc5---zavag.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/78003909000.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dcb97532---bivijoxixo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/4325749372.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9c72817c---6017364206.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473a9a20a4---rofasuduzex.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba78a7d62---51657298574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+lord+is+my+rock+my+fortress+my+delivererPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A1 10712 bytes
SHA-256: 224e6364ddbd85640d932d4a2deb704ed42aadf6a9a0ef741936b5b08d20a08e
font_01_sfnt_off0001614e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17960 19268 bytes
SHA-256: 644bc871b3292a8cf52e589306c252ca7d3711cb9ea2a2d57a59142592f5c41a
font_03_sfnt_off0001a9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9EA 18252 bytes
SHA-256: 54875282eaa08cfb54d6090ee2c3abc4a37bb499f793705a6af91106b44710c9