Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f947fae44b2652…

MALICIOUS

PDF

75.6 KB Created: 2021-08-17 19:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 59630d2fc01dd5b9f491169f67070ee4 SHA-1: e3c49e39a77dd20908db5e5d075a78ed5c856ffd SHA-256: 46f947fae44b26521d4324484de37eba34e2d1cd58c8515d17068c0af170db3e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload disguised as a PDF. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://mrpokedb.com/uploads/files/minaxefilekiri.pdf In PDF document text
    • https://dolaodong.com/userfiles/file/52977322918.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/10148c64f9e8e7d24e71325a4b62f4b5/64164695516.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a136bb99---45725587182.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c574da5c4ec---86013773251.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/84456a091c99ff926af872ce158f3c36/sitedesedelotudekitiji.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070201075573499.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e499725a---48154115211.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/tekezuseb.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/96080143015.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/66988565493.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/681c3e20f13f2aa9d6bb506a6d71f947/19741992200.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/nudiwovedisedar.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9685828fd232e59d1111f13f3cbc4a70/40784568117.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a633f1d6aff---35681462200.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/47625550454.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/30635461412.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/damitek.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/32836314801.pdfIn PDF document text
    • https://shidoremicrosys.com/media/xolirurupozud.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/mezumite.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/15825108571.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/lafenasi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4b34f63b---2475197828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=legal+and+ethical+issues+for+health+professionals.+fifth+edition.+george+pozgarPDF 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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 16728 bytes
SHA-256: c215ff515c044bf1f0956c48aea793dbe4b9d1da0cb0a48dbddc033915b3f09c
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 11080 bytes
SHA-256: a60cbbe86faef423938a45e133ae61a2aadbab07a9ed028706b85f998e5341e7