Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21b19ef13dfa7ac…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 09:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83adb3dd6b65e9ccf60d49c06d5ea199 SHA-1: 1dd369ddf990d5848c77a854d48fc148e36b67e2 SHA-256: a21b19ef13dfa7ac77fb3906dd4674ff83f40e9f1139361eef9b8d0d344cd9a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ausafe.net/images/art/files/50588655105.pdf
    • http://absigorta.come/file/mupureborebakakafolulek.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f934d2b24---zaval.pdf
    • https://sasalidayanisma.org/uploads/file/76697247847.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3a5df77ab4b41c126ffce10ab9f0ca2d/22512725891.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ekjfdalbp9amm80qm8t7umhajg/jixodilokufuloxakatexe.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/sexofugidajozubitin.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24acc2e53---legaxotokuvaxituti.pdf
    • https://betalinktech.com/blmedia/file/1798335878.pdf
    • http://formel1vermietung.de/userfiles/file/revemulefub.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2g0rmbvthgebv3rdmsjsisli98/nipakobe.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2465f3148---jawolize.pdf
    • http://tai-yang.tw/taiyang/upload/file/1650025367.pdf
    • http://broorybulldogs.com/clients/33993/File/zedafi.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/904312025541fbbc145e2f9183bc7874/widowef.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985976e115a---xumekopimurarotepe.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/gevurudaretetelu.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/69fd01784bbacae468c5764d91179465/gumidetabil.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/52447865433.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3ef25941---57999397805.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16088de192f05f---vawatubolotiwilov.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe3b0ed0c1---51676413336.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bd036f27---mesusukudovonomajuxojalej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=convert+word+to+pdf+online+free+download
    • 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_off0000e490.bin
c916c8640ab3acaf9074707ecd70321bb1e2bbd3a4724b8a3bb0c78c23a59851
pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 17584 bytes
font_01_sfnt_off00011259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 16792 bytes
font_02_sfnt_off00012a70.bin
ab3b9707c1767f613f838a1b5c97cf227eb477670f04ab24b465586a05df500a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 10508 bytes