Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aefa73909e57587…

MALICIOUS

PDF

98.5 KB Created: 2021-06-25 21:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b30c84617fdaf6cab62c5dca46c66a13 SHA-1: 9625044ad219a3e451d8bedf4c39517876d8922b SHA-256: 9aefa73909e5758701b2db333b099840535c2ead7486114b7951a5715348173a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be to lure victims to these sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091093f2d367---noxiwup.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/163gs3rdo9kn4qbtgvetrmflpe/wakubijuwuwozutagak.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072fec7accf5---vodanetanadowupijivab.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5f7d28acebc628d3de652bf71e5611a8/58507183779.pdf
    • http://thuexedanang247.com/uploads/image/files/fufurusogoxorax.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/69255a5d6ead437b3b4931011755a536/6792113487.pdf
    • http://nyett.hk/uploads/news/files/88972745955.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160873b589486d---rijobov.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7i1f0lva3dpgmqomfqc1i58qb8/rezujil.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d5da7433---41818740255.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26338a4f1---madorokiwamemaxefe.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5a658127---limaminekuliv.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d35e7d8ce99---86326645393.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073833265aa9---veguzek.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t8btql7121tc599a9a0srhb1u0/mesidozivawofo.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/refarofi.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868de505a13---80914751488.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/713da6177b58a80f6e51c22ab0764330/fomafujufedow.pdf
    • http://alphasigmaoverseas.com/userfiles/file/94900045555.pdf
    • http://ahkjt.com/upfile/file/murumiwamemokofilimizenax.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2178934f7a---45502056842.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eglffn43o06s17qbo2gvt7uok7/30685425922.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a089be983a2---60846596084.pdf
    • http://sportgalaktik.sk/userfiles/file/47872565782.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cape+lookout+state+park+reservations
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
font_01_sfnt_off00013724.bin
e0ec0f37f43407883e9b596b5a7b4256afdf3a391882e89babc432459e9a4f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 17272 bytes
font_02_sfnt_off00016441.bin
7dc7d0e6b81ef92e4885fab8fbc7f672cb90fc1174308ea8f04fe44f7bbc3981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16441 10536 bytes

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