Malicious PDF — malware analysis report

Static analysis result for SHA-256 910c2d517c80418a…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 10:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d43eed245edf621b25ecdbf8f2c6e0a SHA-1: a3889fd01c312138d4ccf8741da83fcc0c1b59b1 SHA-256: 910c2d517c80418aa5d7498730782b8d266f88d58a9e99e28cc01cf7ab9791ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2vmqvrr33dcoui3kptt2v79kjo/sisarokoditud.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d18pq6f7rpk54arng1o8foo7cp/3319140811.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q9f0nae8ui8fotfosigltu6rcd/rijufisobefuwulawixa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/v6cge8is5nirg7qq943oan3l06/xafewususigewirijatatirop.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/59r8j48v972i3ah23i5k8p0do2/wigezilusupopulajarobiv.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/29fdda3cf45248786e12c7d4331e3f59/butanitikavimum.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vga68pqgadber4h4s6tamvvq70/68535606162.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b020cbbd967---jufogonosakaz.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/86863806808.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/doxejumufeputafe.pdfIn PDF document text
    • http://surtek.biz/image/files/20150114_233644.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0881def9b6b751623d3f65ddba9cdc0d/tilifaropenogiwurujuse.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608656edeff48---92243198136.pdfIn PDF document text
    • https://biocoils.com/img/file/kodepor.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f27e20dea---61871490437.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/277a609fdc5fcf82f25a48a59f9b3632/76250870921.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/48315605692.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610723a4042c0---89196560869.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b980508becc---murozofapexedetaxu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/de5d550edc3545a6bb6c912306fac7e7/63739004045.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38718464858.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985ee89c5---darekedimavonu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27ad41acca---lelupuredoragedom.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/liwizixejuzemijega.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/59836130276.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/91946301193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+main+purpose+of+the+correctional+systemPDF 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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10952 bytes
SHA-256: ebf9f3d5ec3b2aefe134e03a19554ff60a5b4572641d100b4e5ca779bed5b73d
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16420 bytes
SHA-256: 80f6e25f561079d99b1666f77234bf30d7175ef6e74ec5068f44db262c26075b
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1