Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f3f2886608da3e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e8681d112cc79441f0b9b6d6f457c5a SHA-1: 434fd83cba73fab7a64a8de99ed86f4c1596ec96 SHA-256: 37f3f2886608da3e7225e16694c0a68bc87718f07acc2c0b58a564d6ab8444aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.findvoters.com/userfiles/file/juwezabedapemuba.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1a3c9931600fac9d3d754ef01a442262/28239125527.pdfIn PDF document text
    • http://coumert.com/images/file/76246313407.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7956bc34f1---73085464025.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zadujubufobov.pdfIn PDF document text
    • https://venus-forever.com/image/files/86466156987.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/muwulesoni.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/fuvubafujawozupusufigaf.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kirukuponaxofubapali.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/333f930b9882d2d787f2c9e30e3a2a11/tonixo.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/pazipatasofoxexoposi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o5j07unnoj4unqvnbas1phjgbf/61651669657.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9edbef0675881aaf42ed2e32deb8332d/benaniguwigotili.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dinjsfkapujcslaq4ntcti16qj/70455974316.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/49471114274.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160889dc1c88c7---23381539787.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-29/20210829142322308319.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/xifetasadegamop.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zufebipaxilenitadu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d5de4ed03fb---xobiwodobunid.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d79cc0690---29476283957.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c05071b2a---46219963045.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/jutemivafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=porous+media+book+pdfPDF 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_off0000bd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD01 10744 bytes
SHA-256: 53f31a3d0145f93873e6795c6a0782426be0ae558dfc5c73444f39e9c0397edb
font_01_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 16548 bytes
SHA-256: 459cc193e33010f4e641a40ab7c6799738346dbc172f134b94e7f846f51d0f1e

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