Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8928a8a6eb3f1a…

MALICIOUS

PDF

129.3 KB Created: 2021-06-27 09:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35e01c17445a3baab3250de8ea2d12b4 SHA-1: 75cc9863323899930ce78783d64fe2b1df22e1b0 SHA-256: 3e8928a8a6eb3f1a22411ac011689924267db9ed7251e0ed6bee2fc519f9f2eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 http://alphabodysupplements.com/newerac2c/userfiles/file/38414802649.pdf
    • http://fitviewer.de/files/file/xofapujamugekizizalam.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f96713d---dinuzorejoduperejuger.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a8934fe93ccd1a59e042233073ad0a0e/retutevomuju.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e75b43413b0e5293787d9cada161214f/pasekuminawulin.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/sevadarojatolidupi.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ss6k07h31jtill07kpu8cl96bi/13385458600.pdf
    • http://theheavent.com/userfiles/files/90055948750.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4v2kpd1jns8qqsk7p8i7vnc5ae/95986111812.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d3e3666d7---62564142093.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7918gno4fqmih4lme4b63cci7p/89861137692.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/93cfee07afed9a9546ec713e2bd70e11/8456165639.pdf
    • https://agatanorek.com/files/file/37235744912.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160940305a9ebf---26730603645.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57b297ead---mizofazibat.pdf
    • http://emirates-offshore.com/uploads/image/file/96813079298.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d8dbcb0ffb24d5fa70eeaaf97437c7c8/kixepuxezubijerak.pdf
    • https://pharmnet.cz/ckfiles/files/files/95440675766.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7bdf89a2c---79619846371.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b76fa9ac24a0c50a49f92fbf123b5623/jobesonegozagufawoj.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500276e2d---32930782708.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/lok06g4qicfek6hqmbki82asp7/kukotoparuguramukabedudig.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c966ed0ea32---6974158183.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ppp+government+2008+to+2013+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c61.bin
bb97f13d63219e083f74d54863f8cdca922518600b029cbb25ea3f8d99fd402f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C61 17444 bytes
font_01_sfnt_off00019622.bin
14363b6b4d12b983d5a8de30d054ee999319fa5ea3284d95795ce4abc12f2c3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x19622 11112 bytes
font_02_sfnt_off0001aff4.bin
94e709c30f5ec68c7a4e0d50884378267c75088eaf9e7541cf11aa63aa69414a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFF4 17888 bytes
font_03_sfnt_off0001df5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF5A 16792 bytes