Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2db8938677dff31…

MALICIOUS

PDF

116.1 KB Created: 2021-07-30 05:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 17f98060ab400bf0f4b085e8e1e4765f SHA-1: ed06264bf753eb2570a55253bc18faeea41a9300 SHA-256: f2db8938677dff31ce1e4c002a10c0ceea07c3c0c12e59ae210a8aae7b39cd99
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aven.su/userfiles/file/bopuvomuzeganozed.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4c70e8e3---satiritirakuzutokaxa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/52ce6111233c8e337c992b3faa51cfe7/54446288264.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kasugukotorezuzejo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/745bfad800b11d7baf43804f9b10359c/jutuxibemufazup.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b883cf448b80128378ccc32ec117f198/82646234283.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1234274e1---19776308387.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/glq6nroj7mqdnoffketlsbmldm/jiturezelevixe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d79bd14d---95355838868.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b9s751423n91rlfb15b0bt9mr7/sijapukupubido.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/56208877302.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2f59ba1d---kubanivozodusad.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/14912211401.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/8281935604.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610021e7f36ce---luwotusazupiwoxexovuxub.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lnqd8gok3rfl0colsts1klqnk3/71450770490.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/wededefuzumakulimavita.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/25b0cb5798fff9c4750d093ab66751a7/tipaxulanikadufiru.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/girawogusavepoxoregojoda.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e769edb5855218850c80f83f11a0b842/20611703135.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/jaganivoteribipexowuku.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/wazavokufajudoresijife.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/38134793389.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f634d385a67---naredu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cuales+son+las+caracteristicas+de+todas+las+maquinas+termicasPDF 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_off00015f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F52 18692 bytes
SHA-256: 1c466c6d647ffa36c2ad6c15caef2f276614a6b14456c8014552f7c46e9b507c
font_01_sfnt_off00018edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDB 10808 bytes
SHA-256: b7d10a8fe343915b5f9fbe779f034378d9e9adfc9e001b9659693ec770ca31a8
font_02_sfnt_off0001a78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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