Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f634a4661ceaca3…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 22:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2f255e0a0b056540f009568814a3d3a SHA-1: fad1852ad5aaa6b3761eba6c39235b0fbbbd531f SHA-256: 3f634a4661ceaca3dc836c14f758f9bb09a65027c2d6938b10682a9cc0340e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and potentially disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3lhd6995q48m9tlat9d322ehd4/xafegafepe.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d43092a08b99e91455fb92514f3cf659/84586214357.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/nawubora.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/97719193781.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4dp7kapg048ff9ggf917fop1i0/37152624417.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb3d01958---78842116670.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///54971138510.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/mirirumeput.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050522554323.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/061bd75b808d00393409dbf2cde28b85/61141052557.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/51264839953.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/nonigugowigowekonelure.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8eb57ebd---xevoxamorajumobup.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/83065236758.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/8120986658.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa220786d---12793470757.pdfIn PDF document text
    • http://inse.us/uploads/images//files/vemobif.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc075df125---lovofotopunubakufuxugu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/bsu0sulk8g3qr969e0sopgf4nl/45580382942.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc8241acf---92752778776.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160947d2452ab4---87415689689.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mq9mbu3rrpmg93jlhkjfcd780r/puvufovemaxar.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/evvlb8o9iljoctmt09cok6g336/kosoxatajovibu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a59d7def1---14970744261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nifty+bees+meaningPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 16324 bytes
SHA-256: bcb75191fa248d224354013e0a4ab4a6517dd3f262b03bf865ea7c648d255561
font_01_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 10524 bytes
SHA-256: 0bfda5e1333e283b926960d6d3ca7f35f95c01f0e56a31842980daa04765d2fe

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