Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ac8dfcd29a569f…

MALICIOUS

PDF

90.6 KB Created: 2021-07-08 08:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f8e327b521b276150e3ab452951fa7c SHA-1: 5d5976d697ddf9c98a0c448d731721fa58e0e5fa SHA-256: 73ac8dfcd29a569fa3d948d551852ceadecdf6a5f6536cd4541e45830004697f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to compromised WordPress upload storage and disposable hosting further supports a phishing or malware distribution attack pattern. The embedded JavaScript likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed1659ebc---gonixatekajonufa.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wotavi.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/pajefidaxisizonovasitawiv.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tirajedozuxasozawa.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/farezikoxakelemivu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a9f6a1a8---ximovaxonijuvavemisu.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/51144262672.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/460d267ece679347bfc2929c42b8f17d/tinoz.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jbru62k5m5llkhjajmmdq8nk64/85168369930.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/71210793660.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/20448173887.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/kuvitetoletenivubuxifeter.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/39711773254.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/raxikoziwekuj.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/bupevap.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0e672a47---tevegewirasi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463717f519---71120575172.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6382f2de1c2cf35ee1449ef654bfc5f7/xaderudut.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hj8rm9gdqntdiob4527rnf51a2/68441075667.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/98190704647.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/ranud.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/fitokigavemisufoforof.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f0324b56655e2548e8fb7fe381244af3/muxexitidowaxejeviwu.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lekobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cat6+cable+solid+vs+strandedPDF 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_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10768 bytes
SHA-256: 3531bff620a125b5916f17300188f724b4bdbd0e4219c48c9adb30c023e6fd82
font_01_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 18788 bytes
SHA-256: cbf0311a5bf56dd541af20ec45459d18a2760552c4fa82475bf441c990648284

Open this report in the interactive analyzer, or submit your own file for analysis.