Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ad79a19e56c783…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 09:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75af73151a8c005c2a998653984d1a7b SHA-1: 164508c18b39ad80c927f0c71d551be2f8c9211c SHA-256: 71ad79a19e56c783cf0ecdd239daafe1abd44134bd97d61206700cb3d5768ec6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The presence of numerous URLs pointing to potentially malicious content indicates a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607290ae345c6---muwetiwowevabojobixa.pdf
    • https://noihoithanhtuan.com/media/ftp/file/pijin.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/cca4679e2e44a64f2a15a8051ed2ac3c/85230836634.pdf
    • https://at1-turbo-j3t.com/contents//files/tapolikunagaxedawefopopob.pdf
    • https://soudurelauziere.com/upload/editor/file/jurudixowikun.pdf
    • https://fultoys.com/userfiles/16124298561.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0590d34b313b1aef37965e672b4fa588/vadulozajidevud.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7073eb67d3---sogite.pdf
    • http://russkiivopros.com/images/FCKeditor/file/24503611578.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5eafe840f---nedadudewarawalike.pdf
    • http://wildpflanzen-planung.de/file/54826985213.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/bikuxezigamobetulojaj.pdf
    • http://schs1968.com/clients/861610/File/vesumonaniwaxuxajujebe.pdf
    • http://talleresjpg.es/img/file/26562110189.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6ed131136271317c7ecc378115d28acd/37531942198.pdf
    • https://floridainvestment.cz/files/file/kisemizerax.pdf
    • http://anapro.com/ckfinder/userfiles/files/kimekojumedifuwiwig.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210630031407194.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754b1b4449---31824606668.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bd9ae699b608352eac0f0b5b66b0ffa3/35524419001.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b12c863a2a5fc00c76ab4844d6f26bd4/lajabataxopaku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+main+difference+between+the+accrual+and+cash+basis
    • 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_off0000ecd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16792 bytes
font_01_sfnt_off000104e7.bin
e75a53dd9d87088b4afec2fcf01184da9e50dcacfa98edddd45459c9c4d338a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 16492 bytes
font_02_sfnt_off00012fd5.bin
dc51379c0bd48ef96f8d402ef6d56e0062d28edc6b376290a2b07c34025168c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 10940 bytes