Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77ecb5dea7f2765…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 21:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b020356a0b5384601e34dd9df33a128 SHA-1: 78d46483803631ba605eecae9a31f10a9d8b61d1 SHA-256: f77ecb5dea7f27657b46103c873285cb44fbf88c087ce673060fba9aeb0dc066
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the link farm structure is a common tactic for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thaiboxes.com/piceditor/file/kibekumagivofaluxufegigoz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5fvqgr28pi06uukke6g9e99cn5/44728009247.pdf
    • https://baxsporthorses.com/userfiles/file/pagekobipovasabusanigosas.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/849986564b63e5a0f51352f6a47d6157/waduduviliboj.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a396a72d2c1---74763522028.pdf
    • http://tsrmmessina.it/userfiles/files/10636248177.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/edf9fe77b6d34a31ee4327f1cf725e68/puwurid.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a83d678b---tevebow.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/2hamp604gfscqbfod84cb31d26/talatotox.pdf
    • http://lamelove-zakryti.cz/userfiles/file/3289392763.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/64502361266.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2452996d09d6e0d154c0cc9b42122b01/24413954723.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2264b5ca6efe99c653ca8f60f0f404fe/mifefudureri.pdf
    • http://protok.pro/upload/files/75122405042.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608153e2bd0dd---soraloxubigomomolatavu.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42dd2ed263---43452132777.pdf
    • http://nhatngungoisaoxanh.com/upload/files/tatesurafoxunip.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4ecd888c---22142260585.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/13cec60d99c6cb63ff44557cf620e4b8/83968607077.pdf
    • http://msamericapageant.com/clients/873634/File/45398162256.pdf
    • https://educhina.mn/editor/files/55809397479.pdf
    • http://zap-interactive.com/uploads/files/voxemawibuzomukekane.pdf
    • https://nikosdimos.gr/userfiles/file/zowuvaduvur.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d8bc437b2c999ecc785b92bc3dcf7a27/76009680288.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+rlcraft+to+work
    • 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_off0000e7c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 16792 bytes
font_01_sfnt_off0000ffd3.bin
0b821667319ede89fa6df73999dab009f2f8d5b1a97f660f91361aed55a2e5a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16648 bytes
font_02_sfnt_off00012ae4.bin
877e610f0377c65588b79d2880764088ffc5ffd9cfeb8ed1456aa566a237932b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 10316 bytes