Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca9dbd61168c621…

MALICIOUS

PDF

77.5 KB Created: 2021-08-22 12:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3add9875b25ebc3e75ebde00f85133ca SHA-1: f5f7017aecf9fe6937568a75a2fb42675e9da0b2 SHA-256: aca9dbd61168c6217ea5594d4e322e147f7be15901862005d6f48610ce6c02fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/46t83qkl5hltlvdca1e0qs3fmu/zowixipijewe.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c4769788---zenawixodavumosusu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba267d6cf1---22602887531.pdf
    • http://dezmaster.com/userfiles/file/mevikewexapobinufaf.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f285b77e7---rawumikopek.pdf
    • http://ac-kenigsberg.ru/files/file/69017808586.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaaea5b10---9350287276.pdf
    • http://karinameal.com/imgdish/files/xagoxafafizanemigu.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/82906b5fb405d7c499e48605e9e455a0/zekujevoxojawudiw.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/pbuclorkdg9gse4pi27l99omml/vebobe.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3334732279---pebaguluwunerin.pdf
    • http://ok-poland.com/userfiles/file/jadomebonizurabowino.pdf
    • http://vkts.se/userfiles/file/92330128281.pdf
    • https://heatingboiler.ca/fck_upload/file/81208991211.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b061403a5fc---38240664803.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1kdp0arimg5drn9fjp2lvst29q/16699891204.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/35fdcf865da95cf326748382aa33601b/25989999022.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/af09771bb2acdb95ccef9d58e78ba0d7/jofomebimali.pdf
    • http://nomorecpapmachine.com/userfiles/files/54882199602.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/75410410762.pdf
    • http://phantasos.org/userfiles/file/sipami.pdf
    • http://yfatc.com/userfiles/file/kefegobul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+much+do+jag+lawyers+make
    • 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_off0000cbdd.bin
9e1fea2a1c55901d919b7ce6d06869d50d0ada8be718ec39eea8b14ae20382c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 16264 bytes
font_01_sfnt_off0000f60c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
font_02_sfnt_off00010e23.bin
181b86e67639f60af7ae1cb08a717cb65ae444b13a0bd6380203cffdf6f9b05d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 11036 bytes