Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8baa1cc78f0cd5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 06:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 243eb64f747c19c159fa2ba76c3197c4 SHA-1: 50eb03252841014dc319164da01edf54f495b7bd SHA-256: 7d8baa1cc78f0cd55b9e0bc0a374de0f38491c6b74d753bc8ef67552d3203d5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=street+fighter+2010+nes
    • http://boxerdapolenta.com/cmsimple/images/file/jidirexeredanobusi.pdf
    • http://hunting.kg/userfiles/file/gupamajidawoverurevololek.pdf
    • http://nwatchonline.com/userfiles/file/94506109321.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/vidizagofovuvexeg.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c760db7722---fujade.pdf
    • http://hataylezzeti.com/resimler/files/53017767433.pdf
    • http://sino-web.net/filespath/files/20210904113348.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pv0c86a76dboa0dc6tr3apl0i4/32043539366.pdf
    • https://taumed.kz/upload/2021/09files/210917083447221411artgl.pdf
    • https://bor-diing.com/upload/files/lijovaful.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/85159926496.pdf
    • http://kaitosushisb.com/uploads/files/21020677953.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11ac96e5c---95766600061.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/46987451055.pdf
    • https://leosservices.com/userfiles/file/9195767382.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/47773450505.pdf
    • https://edgecs.com/documents/72428843691.pdf
    • https://gdaniec.com/upload/files/welusowujud.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378ac9d39a6---8350920535.pdf
    • http://lenosada.sk/editor_uploads/files/gapubiwisirapof.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mufositowarozebe.pdf
    • https://hijaustabilo.com/contents/files/jidarelenumuvenow.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210904_9805AC2105C34494.pdf
    • http://heathrowairporttaxi.website/userfiles/file/rasafabexememuvitisavusa.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_off0000de2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 16792 bytes
font_01_sfnt_off0000f646.bin
b59b21ed6bf0694c4ffe459545117c2379796214e68dfb17898b0bdd28708e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10532 bytes
font_02_sfnt_off00010e45.bin
88d4b0cc078bc5df21aa62a2a7c6283efaef0782dd9235ac49f7f2fcd192ff8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 21788 bytes