Malicious PDF — malware analysis report

Static analysis result for SHA-256 81026af44e5e0aec…

MALICIOUS

PDF

78.5 KB Created: 2021-09-29 13:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56a4574a79352aa62490678a71830d10 SHA-1: 8c3756f92dbe2cfaf6b4bb41c299be1a7f32d72f SHA-256: 81026af44e5e0aecdf590aa68cf804a22ef8f93d0fe0ac3dc966e9214ce4d945
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded JavaScript and numerous external links, including those hosted on compromised CMS uploads and disposable domains, strongly suggest a phishing or malware distribution campaign. The primary goal appears to be redirecting users to malicious websites, as indicated by the link farm structure and the presence of UTM parameters in some URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=notifiche+stile+iphone+su+android PDF link annotation
    • http://hz-karavany.cz/ckfinder/userfiles/files/91392748210.pdfIn PDF document text
    • http://belv.ru/userfiles/file/xisovogike.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/63059862638.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d266db51b---baliwabenanafava.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sejoludepowijo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139429672582---96459429034.pdfIn PDF document text
    • http://salt17.com/userfiles/files/23611716588.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/57887473037.pdfIn PDF document text
    • http://peoplefoster.com/pliki/84997786281.pdfIn PDF document text
    • https://fond.ru/userfiles/file/tizakuwoxibibiveva.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/33663378038.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/17071048405.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bf611d3a9d3f626be2d41b24ce5e1191/42125713090.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/bipidumevatavuseronov.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b8de271c170bf7b07a1dbd8b816f1677/99367042596.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31438450e---6500428520.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/rokokasapodepokupa.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/jiworedanoze.pdfIn PDF document text
    • http://symbolfoods.com/files/file///vurozonaz.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/65764417967.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/61913199410.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161487e77db2a2---27693640301.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/22226620010.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/sefonekofodelob.pdfIn PDF document text
    • http://gynekolog-zilina.sk/uploads/fck/file/22258274744.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 17180 bytes
SHA-256: da47fb0e71fa7f4ead473c11720d5bdb5a152e4dc7d1059555ed1264084d01df
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10796 bytes
SHA-256: ccaf8f16168858a068a83aba236b9a25e1ecbd75355eccc3fae6f40024c51f80

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