Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a12d069fc66ed85…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 03:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95017325433f781e9255ad61cbf782f8 SHA-1: b76bdaf5f678d8a78dd698a04e08f16ff162bac1 SHA-256: 1a12d069fc66ed859446d2daf140387f48671ccdf272c11896915a0e9e71bae6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to compromised CMS upload storage and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://lev-steklo.ru/userfiles/file/pebonewodelisomuv.pdf
    • https://coil.hk/upload/files/3955683503.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4jfhbl5vu3jh58kunbjsbf37uj/86693948334.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2b06a161d2cbf47fd23da19d4322514b/6589311842.pdf
    • https://urology-andrology.com/userfiles/file/16646963724.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/vibefipademinebugufek.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c781518866---39288184672.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cc51007e132a3b19b25c1bec9b88a2ab/94152381898.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tkcplpni24mgsis86lg4m46bkn/86634217294.pdf
    • http://jonme.net/ckupload/files/wepifalu.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d56c2014---51844062027.pdf
    • http://rajskiewakacje.pl/userfiles/file/kusakesaradopamimo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218ab1a8a4f---pobumaruwaso.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5cb3327d1e92eef17498f35fe8f1ca65/94804130575.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b3c6689674821ef91c1a644f8e810de9/pawasuzatomitipinuledek.pdf
    • http://studiotecnicoprato.eu/userfiles/files/32475054876.pdf
    • http://gocep.org/data/userfiles/files/8335364914.pdf
    • http://accessprecision.com/userfiles/file/735554252.pdf
    • http://campfirewtx.org/userfiles/file/25434237743.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7ucoj78eu600b43p48f7enesc0/98901619496.pdf
    • https://ciar.vn/uploads/image/files/xisujulipujolafipox.pdf
    • https://decoveinvestment.com/userfiles/file/pokisemekamut.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/74fbf2dd3d431773cb0e6441aec94ba0/jogogodabo.pdf
    • https://network-italia.com/file/31684217801.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/bejebidomapizajurizu.pdf
    • https://glory-aqua.com/userfiles/file/kozetoxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+guitar+lesson+book+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_off0000e4aa.bin
a24dc17a69daf2cf0332d90549c76a017ecf7f6c3a1540fb141009518bf0e569
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 11056 bytes
font_01_sfnt_off0000fe22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
font_02_sfnt_off00011634.bin
9cb4086597f35928743ab2781272c752b3969fa66f28b1f499aa597e6e384ee4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 18176 bytes