Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a318cc74d1bf12…

MALICIOUS

PDF

89.3 KB Created: 2021-07-03 03:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79e648e732bfe0289cd644f201ed7bf1 SHA-1: 70add62fa997f8b199b12ef732cb2f7820609aa5 SHA-256: d8a318cc74d1bf1262dd326728de5f641d68eee67689744a6b5b47e31153f122
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into clicking malicious links. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae0981c41---37893605222.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/5qr4anvb5145orauosol5tpb92/32955179940.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kafugepokusa.pdfIn PDF document text
    • https://banghenails.com/upload/file/59649932433.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tejh1i2l8hg2od4dvhc2fos1s1/vivigedinezi.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/riluvonopi.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/wivulegem.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/eb45ddf7f2011297064757b3e33011b2/palikorava.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/28725715893.pdfIn PDF document text
    • http://elitvorota.ru/f/file/figiwonu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vjomcoacmfss69odfi0adugfcj/berudokomo.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/10896722532.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55079ffc6---fosewumisigitelu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e35091a7a6cfe19d0428b43205ecac7b/mujelawupemikolidubiwu.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/rekalodepazobof.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b6efdbb---xiwopowulixodow.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160868864214fb---76980133026.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b316090f---juretaporuzute.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/utoemh79k301bicbcbsvaudpoo/linum.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/rifetuzurirowaxebefib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=site+or+sightPDF 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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 17792 bytes
SHA-256: 9179eca96ce69030afc9c97c243f5bfa51ad55e56f26bde07f43d7d299ede161
font_03_sfnt_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 10148 bytes
SHA-256: dbdf00b1d63ba19e68f4d00991d35045459dc3638b0cab1ad6f1a61e97b13529

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