Malicious PDF — malware analysis report

Static analysis result for SHA-256 208b98b7cc216d90…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 01:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1db0ec399295337f97c51b413c4491f SHA-1: 525edee4d5c7149bc36327a4f202aacba5235853 SHA-256: 208b98b7cc216d9044de6e74ea506aa06525482c581d7ff0e12ccbcb02b3100a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, increasing the likelihood of malicious intent such as phishing or malware delivery. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://muguet.fr/sites/default/files/file/18912759179.pdf
    • http://mini-garden.ru/userfiles/file/nubeko.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9f32d45c---76515642972.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84791500a---23834559600.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/34323594589.pdf
    • https://uniontend.com/userfiles/files/vulunitakipavomigupufe.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e81531d89f56ac7bd509b2afeae0943a/ropodatazutokamul.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160866afb200f8---9698216806.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607724668b0a6---47367622616.pdf
    • http://dkmmotor.com/files/userfiles/file/30544598508.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/99ea97ffbafb4534a3daec298083e596/sutuwudajisawumopizo.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085d65e2ae2d---57953081072.pdf
    • http://c2ctrading.org/cms_upload/files/1399564694.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/womopoxadu.pdf
    • https://swift-tw.com/lcc/upload/files/sawozezonasix.pdf
    • http://fw-simple.com/uploads/files/27188336460.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e3fd387b89c7b1a3a076ee291338e561/zezafuvazizudow.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/josafiro.pdf
    • http://syuncyoku.jp/upload/file/borub.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2640bfcff60dc13d2a3b222d018ba345/54463514625.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/it702t4l4u4ii0vb097s33hg7a/8865856676.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ec41382---57319846341.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c62764f8---gizusewofawarix.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6fd73afc93d4487b9f0b2ab3348c8746/67914599947.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/22se1gs5d38qm9ci63i6ghpobj/7268978901.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=infringe+meaning+in+bengali
    • 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_off0000f5d5.bin
9c1546296140cd42942047a1a0b6ad538c854d4aa058c753e88b9b60197de73a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 10260 bytes
font_01_sfnt_off00010cc3.bin
309058225238b6e650d22b534cd6087fa35c01e825e3be7b06799ee2f0c2e1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 18884 bytes
font_02_sfnt_off00013e17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E17 16792 bytes