Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7220ed2b9a43524…

MALICIOUS

PDF

98.4 KB Created: 2021-07-08 02:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e956d31acee75fb66041f87fb9293419 SHA-1: 3d2a2a46e8f35ae52fcbcacf43561658021c4c95 SHA-256: a7220ed2b9a43524ac857ab9a5021345106115d33ef6983204ceaab8fead222e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware. The document body is unreadable, but the presence of many external links and the compromised CMS upload heuristic strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e755301f---kitaxit.pdf
    • https://aduanaldelvalle.com/userfiles/file/natomanip.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf5030587---lufojusaxurajitowosum.pdf
    • http://www.findvoters.com/userfiles/file/25012526141.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e27d9b617eceb348d3ae50bc9ee4c68/mawugupipodesupajufesos.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/73075924874.pdf
    • http://hockeydh.com/files/ups/files/lomuw.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd65270e656---37855513419.pdf
    • http://abpaluso.com/upload/file/3679037804.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/aa4474b7f4d6f96b677561f602d45fee/xolajipivinijurugasu.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/tijuwagozu.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/f44863daee0822fd1795a8186807dbf0/89348559237.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b8099e7f5954772d218c4074d1c45925/56267656565.pdf
    • http://akcjonariusz.com/UserFiles/file/duwimimidesipegixirav.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/acc76fa43d059b779b184fcaf52251ca/dunalisufewowipijinimax.pdf
    • https://abe-rdc.com/userfiles/file/99964475109.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/94176725519.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a353cc192450389887650882423ce7f/83950008880.pdf
    • https://telewebmarketing.com/FCKeditor/file/72224371938.pdf
    • https://securityguardsupply.org/php/uploads/file/dopavajexevu.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d4630978d33f04e38fdbfde8aafebc5a/lozafi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757f43b0edf---97048464276.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53ac7d164---75293381758.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=guinea+pig+flower+of+flesh+and+blood
    • 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_off00011916.bin
524443595e0dfa9368cbcc24754243d28babb085ec28af1493e842ebfcbe69a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 11044 bytes
font_01_sfnt_off00013253.bin
6371d2c63bbaae0b360b2ef97642d7959f81450278f6e5496c69d203c763784d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 19572 bytes
font_02_sfnt_off00016432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16432 16792 bytes