Malicious PDF — malware analysis report

Static analysis result for SHA-256 716a3df2e1a80ac1…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 16:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 201c037746f0a5412a5ec44ffee0e510 SHA-1: a92c3dfe28c816cfbee11fce12195ff2ed40fa98 SHA-256: 716a3df2e1a80ac1c4c8789b80a35371914383216d8d4c704c652b8861f7c5e4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, which are likely used to redirect users to malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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://drafthe.ru/uplcv?utm_term=largest+cities+in+the+west PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3e3b38c3---75809418991.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/nofufivopazomifari.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa1dac085---lodusudolosibawipeka.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/wasesiwukezami.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/01bd8acff62d918e2b835b620006f18a/nogawakimujotepomavodop.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/4365528701.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/wozitevu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721f874912---38369819090.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa481514a3---66774132537.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee248cce3---sidazixeloxanewizukuro.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v46fegv9iklfc2djicg3n56bf6/76310703026.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb91462244---93286089777.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/bifemamitake.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1jr4g4mkps0sk3btc0ajvdvvc2/naxalenurogixututovepanop.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/6884294597.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/7683416042.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/337871df9b8176298b4e266043b7a331/41945852242.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072be21219fb---4049717955.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/modib.pdfIn PDF document text
    • http://euro520.net/userfiles/file/162128964662007474.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/52908970922.pdfIn PDF document text
    • 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_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 10388 bytes
SHA-256: 0596a07f4b576f6bc5978600f01c61a17f8f6b18790129abd2fa3ac928efbf9f
font_02_sfnt_off00013bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC8 17920 bytes
SHA-256: 5a03051e6d8440e49d9e206757b285e78659f6388089377dfb69cdbb703c6d08

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