Malicious PDF — malware analysis report

Static analysis result for SHA-256 726c304ef0b94a93…

MALICIOUS

PDF

73.1 KB Created: 2021-06-25 21:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975cc554da28f01040e87509787a52ce SHA-1: b16277f542db6273db367450d624743b70ae7142 SHA-256: 726c304ef0b94a93b4242934a05a7fca5cc55bb1ac751347f4c95d54084001d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads on various domains. This suggests the document is designed to act as a link farm, potentially leading users to malicious sites or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e87997dde---ruxijakot.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f8b831b0---xipodabod.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/3458063210.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nilaxipifunaluxurobuwoge.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dc54affdf25a8c0a3cfc8463f171e903/18175073557.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608661f5c5d4b---67432315954.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f626eced7---goketeve.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/79536652241.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecf51a594---jomonafo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8a07968c---goluronira.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/185cb4243ed5d52d6e0dee2a9bd0b249/laretogik.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839e03db254---99759728080.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b9094e41674e3a059e1eead393718105/wutakikiz.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/26724734357.pdf
    • https://rijst.nu/userfiles/file/5648055387.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff1e07cc62262c26b2113e1b421750fa/mujive.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1854a294---wazisewofilajixoso.pdf
    • https://aimara-bg.com/userfiles/file/subafigekemik.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/heuqb485p60sj2lt3pfeeqk4g8/bajagusi.pdf
    • https://alatheir.com/atheirwsfiles/file/fojaju.pdf
    • http://www.findvoters.com/userfiles/file/balobad.pdf
    • http://nfc.soo.jp/file/82146304880.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bb0d2ba---kexipugow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+jasher+in+the+bible
    • 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_off0000bf75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 16792 bytes
font_01_sfnt_off0000d787.bin
39414ef441e283847c776bc9f0f929a34c0ce6b97dc07e54dbff19e0c84e7a82
pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 15736 bytes
font_02_sfnt_off0000fff4.bin
58041fc8cdcdddf88cae170bf78f18a18ae99458d88a5cae3cc20128750109ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10348 bytes