Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee759bdb89b9b8b…

MALICIOUS

PDF

98.0 KB Created: 2021-07-01 09:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75f8db0d19d16687474b9277c3f6cba4 SHA-1: 876d663f82ab48bf29d13af79eeae1f479cdee5c SHA-256: aee759bdb89b9b8b73d0bd0ce8b30cda69b11c29f7e0140dd83ec44b33c43504
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to various websites, some hosted on compromised WordPress installations. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 https://crewmak.ru/uplcv?utm_term=thick+mucus+in+mouth+in+morning
    • http://anatolianlgs.com/userfiles/file/25745658707.pdf
    • https://audit-advisers.com/userfiles/file/72622476475.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/e7cc49ba5d0a4b77b51d68a271c12cfd/55102383349.pdf
    • http://soupworld.de/upload/file/80130254668.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b87976480---zoladusigubugufijoki.pdf
    • http://www.aluvascientific.com/UserFiles/file/fapix.pdf
    • https://htddienstverlening.nl/userfiles/file/60683127922.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7v7pebmk7qjgt49lpesuqnc8vd/58221591710.pdf
    • http://ventilatoryzlin.cz/images/file/11977614156.pdf
    • http://easyreturn.store/userfiles/file/13277504259.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f590adm4km6ma5ne3l577d7m75/11088354240.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcf24dc7a---1390071905.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/u9c2mbmtft7ru21ivmsqr8qjbd/finigizopifikafawu.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8f15f2dba5eb53094388307ff081def8/dagujez.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2bef2db4---70493478752.pdf
    • http://mutitar.com/user_img/files/jaxokiwikumirosojifijipoj.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609beb1cd94d9---zatelizuzavese.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ce6mnq5bae5fd25anngg0k1mqe/7924559223.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ff4f0840---rifokuv.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4b819c066971bbbe8c321385f5dc9c12/povifivid.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r0irvi4njlm4nhmn5qh1suomko/neloxonazebi.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-15/20210515190931817974.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad73cdae0---93077170789.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/614ce56f1d114885c789fcebcfeae4bf/lazoxiwuw.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/363cab8dc66ba4aa566ec99b7396230b/9035809880.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tvtdeddhq1lrg9bffqf1rmodll/safibevamobazu.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30329821405.pdf
    • 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_off00011ea0.bin
f5f103d8249be9bc7d7c1e801d4715f8f028157335b1c44a8ab124076df57144
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 16988 bytes
font_01_sfnt_off00014ad7.bin
920c1508dfd3addd8c9bbad0f57b0336d57b6ab32c83334ebc32eae050793ff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD7 10492 bytes
font_02_sfnt_off0001628e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1628E 16792 bytes