Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae191820b8bf19b0…

MALICIOUS

PDF

180.8 KB Created: 2021-09-10 03:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0e360fd7e7b833858284d26cc55f781 SHA-1: 386fe4e91c0645d5d751ab6c4defc9f18572daa9 SHA-256: ae191820b8bf19b03f4fb42229512f0cfeb2a517039a58ca0909ff6859526a1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely serves to execute malicious code or redirect the user to external sites, contributing to a phishing or malware distribution attack pattern. The numerous external URLs suggest an attempt to spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=blessing+honor+and+glory PDF link annotation
    • http://hunicorn.hu/userfiles/file/pafibej.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391b04836fc---derapo.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109082037049299.pdfIn PDF document text
    • https://afayl.com/userfiles/file/75172994910.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/wojeradabiwi.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/40952894165.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/duxoxibobi.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/75197869287.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///27876141189.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kufikesawokajuw.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/mudoj.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/95177806535.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/45337642833.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fcd7683490---javiluviloxoremuvatomi.pdfIn PDF document text
    • https://lecachet.fr/docs/files/faradanajuvebetitezota.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/wojetoribovogusuxop.pdfIn PDF document text
    • http://etkenkalip.com/files/foravuvadereworagabanibo.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/penelu.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/pakenezolewawoxep.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/nubinumatan.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421578e2bf---zonewejavi.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/semunuzodavurixizi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/jurazerilimujadagom.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecce8bf858---70600366998.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000259f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00027202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27202 23376 bytes
SHA-256: f12973b3856d7f61f977f1527c9c95a4870b792c343df284581a07242d274e2d
font_02_sfnt_off0002ad28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD28 10596 bytes
SHA-256: 4bd195f4df86aea46371fea1a88bf33c19d54b6140ea33ad4357e0a456cb6871

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