Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42a80e93035ea49…

MALICIOUS

PDF

85.7 KB Created: 2021-08-20 12:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1313dbc0b5663e612d5db8d703d093b SHA-1: 5c20d7d6f39346f36fbdd991f3c57cb6ccbeea22 SHA-256: f42a80e93035ea49e79b6c1b55f1720f3a654d745f9e1de7b095a6970e0f32ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or suspicious domains, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://likeevent.it/writable/public/userfiles/file/78422510284.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bc45b3a466bf342b6e8232641187b466/89467753497.pdf
    • http://dges.in/userfiles/file/80445053899.pdf
    • https://kamarkosong.com/contents//files/nuxibuxofovog.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b108d6f9d6949c059c4edb4ed01a0d7e/xezetivudenokapakuxu.pdf
    • http://bdaudit.ro/userfiles/file/wuxuzoselezadaman.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e2it59ut351m6pr2q7elm6aefj/79331916807.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/57973576799.pdf
    • https://es21sys.com/userfiles/file/21261753667.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912fc30ed92---74024150537.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tb6d9lppql38jkagmm9u4tf345/3420865775.pdf
    • http://alliusie.com/userfiles/file/2017315165.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e8218be2d81b0e672d80926bae07702c/kelubova.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3fdffacc5857c7630ce7e5c71b3c571a/liseno.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/zofesoxal.pdf
    • https://iamtimeshare.com/userfiles/file/25339198926.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/89030655536.pdf
    • https://1877painters.com/FCKeditor/file/92224200160.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d1f521a0---13524311930.pdf
    • http://synerfreight.com/syner_upload/images/files/wajatunutofup.pdf
    • http://ctm.it/userfiles/file/50528744288.pdf
    • http://www.derbysignandgraphics.com/uploads/file/wugute.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b9gl3uk0mvf9sn4qoodugjpii0/37586860818.pdf
    • http://hy-concrete.ru/d/files/43293109885.pdf
    • http://maroba-zirndorf.de/file/ruxokefijoxiw.pdf
    • http://mim2010.ru/userfiles/file/xebeti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=does+direct+deposit+come+early+with+cash+app
    • 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_off0000e967.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 16792 bytes
font_01_sfnt_off0001017e.bin
6574b523948d09156b745c35c6013f7a94c0c25f97fea9d9cd76108105bf36ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10876 bytes
font_02_sfnt_off00011ab2.bin
60f7dd84936f8194ab708fd8b794ff431a3e317f3c592bb00aad718eb46c7f2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16680 bytes