Malicious PDF — malware analysis report

Static analysis result for SHA-256 621b2e7787562e7f…

MALICIOUS

PDF

115.2 KB Created: 2021-07-31 20:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7285b684e6b00ccac777c40255b78601 SHA-1: 1581c04989cc57e5e945112f21db9303c992b970 SHA-256: 621b2e7787562e7fc4935a0be6ac2d47e76b68d1200a78317303b8dc483c6e32
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious intent, including links to compromised WordPress sites and a high ML classifier score. The presence of a 'download button' lure suggests an attempt to trick the user into downloading a secondary payload, likely another PDF or executable. The numerous external links point to a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=interzone+485+data+sheet PDF link annotation
    • http://lordbeaverbrook1973.com/clients/76835/File/139399860.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210731_CB41B0C2728DC033.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935ca22c0bd---71697418126.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/857853eqqiofu2l0oq850c8t0e/8137731385.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sjitmg94tksfh9972dh3ggeo74/lisizilomiwefa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcn20h2otn0at8s33lu35rlr57/22169421443.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/529673454253cb145bec8d56445c8a32/37862582635.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c238ca0bc74---jadebupavunobumofapavone.pdfIn PDF document text
    • http://kag.fr/userfiles/file/35418046978.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8485c412d0fd591b68b37a5c7c1f7b11/soguziduxuzufagipo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23c50da7f---17274962962.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/12jdtkvh6ubqfo9kid8ac9s631/pobibugutewimadikejusaz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2ceeaf97e2271cf205cf78e59fe8228c/bedibudikisi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/36626745078.pdfIn PDF document text
    • https://soechi.net/userfiles/file/boxubezudor.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b96onii46d2gt4g15ierhm9rr6/kemajenev.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6765d4a2---71804114046.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/natizetozopumiveser.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/zukatujame.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/30081853266.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/69137477177.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/87198055771.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607236a16c561---39153892565.pdfIn PDF document text
    • 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_off00016041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16041 10640 bytes
SHA-256: 54c2623d2611601ed7c1807249c0ad123c32233dc632cb19c0ca088740522cb8
font_01_sfnt_off000178aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AA 17588 bytes
SHA-256: 2923174c159bbbfd0c0cbc22204517c4af2ea4cf26edbda8708738b453fc65f4
font_02_sfnt_off0001a6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.