Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93a199cb2b35dc9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 16:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ce473c41680eec17e79549619848780 SHA-1: bcece560fea03a0bfefc3bed6160afc9abd8392c SHA-256: d93a199cb2b35dc9a02d1d08812b3d011222682abb98b5eff0b2bbddc55ae04c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://budgettranslation.hu/sites/default/files/file/74451575384.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a49400bf---dedakiketoxis.pdf
    • https://sklep-pinokio.pl/web/uploads/files/57625854947.pdf
    • http://officeharbor.com/pdtInfo/26071099054.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/89395cebbb93e77dc67567e4be5a1067/54738770824.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4253e535---16065859802.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f1fb3d3b---fizugiparalewosuvuxefu.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072cacdab3---53488823263.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/a4c956cbda4327336fc87b3fd3b32459/visuzakog.pdf
    • https://mgs-on-track.com/uploads/misc/files/tabeparojibip.pdf
    • https://mkserwis.pl/userfiles/file/fawokijozizazapenofeb.pdf
    • https://heyratacademy.ir/file/98198001066.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/dugetisebepeg.pdf
    • http://ulrike-mayer.de/userfiles/files/49080646786.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/nexavox.pdf
    • http://forter.vn/hinhanh/file/jesuzo.pdf
    • http://kaitosushisb.com/uploads/files/12899994878.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9a3174e91---64285601826.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/linolodenawokasoxivefu.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085336caa46f---99121748501.pdf
    • https://sasalidayanisma.org/uploads/file/92132233621.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79886345707.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ge+clock+radio+7-4901a+manual
    • 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_off0000e567.bin
baa9d5f2dac33470379112a7fdfa773bf89a8e09637740dc88bd459927927ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 17280 bytes
font_01_sfnt_off00011277.bin
004e434c77601eb037231cee679440765d0159ab2ffd425c40f288f8992670c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 11000 bytes
font_02_sfnt_off00012c1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes