Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eb813c3b1a9328…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 01:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f068221c98b7945f69371a0afba7b48 SHA-1: 7ac92b175b8c21846658457b0c696c58b0a223f7 SHA-256: a6eb813c3b1a932898643387c3f423706b970114ffb2984fd2967a7ef6bf4d0c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing sites or download further malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://vinacomvietnam.vn/uploads/news_file/takakinawunosupepelidure.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/dabdf6683b271079c8cce3b29791e4e6/17539147704.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078d69ac70a0---40197952098.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ll42hi2he5e7sbof9tdrr7kejk/gefuzebapofumevurapuwo.pdfIn PDF document text
    • https://susta.vn/userfiles/file/35691397594.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef3b415d---woxonefigemagu.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210604_F146DE19D6297690.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/sofivaraw.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/42baa553c5642d2f7d3355ae1076202c/78671765443.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ad34591dcbef010e935e0e10e60bcfe5/49578409361.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be559a273b9---lizikedopobunologazukanuw.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jupulinuzalazopumomeg.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083031c81789---11769152910.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/bd7f24be5e1e97810e5d893209dc80e7/bigopezozebipewejase.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/kopomowusebididabofo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70934622082.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/24a030ebf62478ea5661f8b3d0a760ce/tutalusuwa.pdfIn PDF document text
    • https://alutat.com/data/file/67579094723.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ll4no98jalmihseqldo52jhvc/mitasuruzukuwidutukifu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627055845584742.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfcec7cdc675beb62bea91e469a62b2f/96744979108.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77670af7f1---43954685893.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/54922789656.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/rasobuvolun.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8da338176495df30b2743f707757da6b/15287540133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+charismatic+charlie+wade+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16600 bytes
SHA-256: 9c94185ecdd32c4c857db8d59de274606434b563d518bc49205bc60e22e522b9
font_01_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 10932 bytes
SHA-256: 40493e07b4f116dbc4ecdbd575377309e259e22bb486ef968defd63f5a01a7af
font_02_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14871 3288 bytes
SHA-256: 0fd0baeb457f6836a397fc96f0d0040e511f6425ee937c59a2cfdd4ce750e36f

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