Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ffc1c4f0edb6be…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 23:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0832470ba26c7b40a89af1aec279fe SHA-1: a519b71bf66f6a16d4740aaf623d0f81ce91d251 SHA-256: 33ffc1c4f0edb6beead6fce9192dd0af36733efd3b8098a0ed95ea9b60ed8050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary attack pattern involves redirecting users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=tom+and+jerry+willy+wonka+and+the+chocolate+factory+watch+online+free
    • http://nationshield.ae/userfiles/files/sipovepexeduxazorosuril.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/22619616142.pdf
    • http://dopuskvsro.ru/UserFiles/68265308468.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/69766120365.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210901_314627F6D0F247B6.pdf
    • http://f1-rennsimulatoren.de/userfiles/file/jogow.pdf
    • http://biogenetec.tw/image/files/20210911_234858.pdf
    • http://jongauger.com/userfiles/file/66808669410.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/78723b86aa9bab313e888f888e07dc4a/zedug.pdf
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/6971905009.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613736bd00376---tamoxekafiwaxak.pdf
    • http://web5gstore.com/Files/files/nawolewil.pdf
    • https://quizai.com/uploads/files/latupafirakiwulaj.pdf
    • http://vansuloi.com/uploads/userfiles/file/xakojinoje.pdf
    • https://bipalisdemo.dashindonesia.com/userfiles/files/buxixifuxabepojoxig.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2573c80bfe29560ccae8264c7881c86/tosakegazupaperosulajifu.pdf
    • https://minjar.mebel18.com/uploads/files/gisivapebovi.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210906_163850.pdf
    • http://geoplan.su/userfiles/file/61137450089.pdf
    • https://elperrocallejero.info/ckfinder/files/51089769249.pdf
    • https://nenmongdangquang.com/upload/files/fadixowexepen.pdf
    • http://sostrevalli.it/userfiles/files/54938508134.pdf
    • http://dorapeyzaj.com/userfiles/file/71705116741.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83234708482.pdf
    • https://chmelo.hu/sites/default/files/file/ginaferelagapu.pdf
    • http://www.ekoforte.com/upload/file/fobekegozanosazego.pdf
    • https://itscebu.com/upload/file/20210908193533.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_off0000bd1d.bin
907b3007954c19757420bb482ac1afe3c6a65a91308a2baa19b4a01bc7198945
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1D 10960 bytes
font_01_sfnt_off0000d65a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16792 bytes
font_02_sfnt_off0000ee6c.bin
8a48aab4cfe5cc366b108bbdc482b3fa79e37729b8ed7322f768faeae9af569c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 15404 bytes