Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7571424d8d70068…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 21:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ab449564d59f48c21bb0b82bf528ae SHA-1: ea6d37eb1ce60166a3cf8590274493644cff8f4a SHA-256: b7571424d8d70068b9b1b870a24684d16634328c6a190a9af6370ab5b76bcf6e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=drawing+crossword+clue
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a4ec9676---tesuraxizogifuvosawamum.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffca18ce4---tagesabapezodifa.pdf
    • http://obrienbuilders.com/userfiles/file/bukufa.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160de2b013154e---65565294607.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/20lmeto3s8r9bivjnb2ockqvo0/ropavafofegivalajigupapoz.pdf
    • https://lemanssrl.it/file/36780227766.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/demikogugarozekesekorokol.pdf
    • https://aiaciran.org/cache/fck_files/file/84804736441.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/89773766685.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4eaaad326f01cd9f19cd517aa7e9e667/36225377067.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0bdd82badf03133fe5a92fc7114926f9/25852577076.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/3038463639.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c95446616f3---vikofosuw.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da373e71b---6171252980.pdf
    • https://oklogistic.lv/upload/file/39763540632.pdf
    • http://chonburi33.com/userfiles/file/devugodukupirefobimil.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a973e229---vowili.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1f1959d58---50760199415.pdf
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210707203100.pdf
    • http://sbkf.org/files/files/napiwewox.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/33719a164c4676218670aa6a532dab73/64116177507.pdf
    • https://benqmusicworkshop.com/fupload/file/zesupixepiwiv.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/vudemorizade.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/940e1f670df0a3b3a233fd83bdf6d28f/tegewovabijazasujiz.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609327bb4bf9c---48170270231.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ef7bb6c3e90391639d536be9d0718602/zurukovin.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_off0000c90d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 16792 bytes
font_01_sfnt_off0000e11f.bin
d00dbdbbee98f9ef5f3683bce5a7d67b91da0ea5715551fdb9fc062a897d1d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16588 bytes
font_02_sfnt_off00010c4e.bin
b8ffef063dbcdfc76f3a6c3816190c2cd2a9f4046a525f1260ea7cc670fdb159
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10636 bytes