Malicious PDF — malware analysis report

Static analysis result for SHA-256 99059f344897f0e0…

MALICIOUS

PDF

90.5 KB Created: 2021-08-24 23:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f24f4925fca9934d8b6370a28b79adbe SHA-1: b89e7014dcee261472099423b0639bd381f69f65 SHA-256: 99059f344897f0e0da1394e865a838c50cfafc8991a02ac66f2392d5274e70e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable domains. These links are likely intended to lure users to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://vhktn.at/images/content/files/balabaxuzuzupabitan.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98140bc9d---30986836084.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6040a83fa71e7fb1bef4b14056e32088/tetirusajesujadaje.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5a07cac76a8af37d9f7a0532fd32e16/14934201435.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c2e4de12c51b2f09a96084f4ce0fd4e2/1289362286.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bexudin.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cebe99d655---dixulodopaji.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6b0eac23c---bikokezijaxaxa.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/4789839907.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a9714709adb13f8afa29469099b8c837/36021876027.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d96e27f98---44721485246.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609547b448696---tisasa.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28767219533.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/fisadufuzarazopivogeput.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a059559522f---40864829618.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2ef1b9f941c1edb8b55a4dff8be44109/dinixesaxosimugitakefot.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca83895a0---vifuwupadogo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf42f70f59---60224958139.pdfIn PDF document text
    • http://dakmet.pl/upload/65870669926.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ropif.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/31984209922.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/36141895985.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/12300810349.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dea5dcf7f---gigozitopi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9757496d9---42716335652.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/99256182018.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/g51l47qjd0cl1ti5bljm0mna95/pexexeregodagojunevozora.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/58501695507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+the+shop+scales+go+ding+in+untitled+goose+gamePDF 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_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 11132 bytes
SHA-256: d242fb91d42b4fe2e6fc8a06141533ff16691e0c97d45d4adec6325b7c40d621
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 16760 bytes
SHA-256: e61544b2f8dd33c8b10194ceb7c83e677f8ec11688e75daf273590546e9ace96
font_02_sfnt_off00014368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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