Malicious PDF — malware analysis report

Static analysis result for SHA-256 20eaac4af83215ca…

MALICIOUS

PDF

86.3 KB Created: 2021-07-15 13:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0825a288412b82f660cd7d23d2c1cff5 SHA-1: a926961574089857451cfd6e356a3a16b39321ac SHA-256: 20eaac4af83215cadca954293becba5837a6b770c2af5835e0913cca0560e65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection names suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cedarvalekansas.com/clients/875954/File/38770417557.pdf In PDF document text
    • http://pelesiuvalymas.lt/i/File/23995111810.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b623ad19---12134104270.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vibikolegon.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cjl4i7p7rjkm2lkudblaa6akh4/19660869996.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/1985556819.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ecc8987f---kilomotolir.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e035285cbd---90448396349.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/17872817551.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6ffd4386---vuduwe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160985e39306ac---94649823513.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f507133a6---24411703566.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dusubebixobobovoxevaxu.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/42503257237.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d20baccb---10783353399.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/sesekaberolowo.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/91313932632.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/84610206083.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1b88ca32---15457486206.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h1pudt9qq57cnueu5jtpj1q7r6/xotipiwiwexare.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f3f68460---92447629541.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/21ddv9697vcvh8ch09qqsabcb4/diretupegesakakodagobi.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/wovojolebezuluv.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/58gh5fgh1upvsdkvikb68nepj4/28362304414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=maxwell+equation+in+terms+of+scalar+and+vector+potentialPDF link annotation
    • 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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 11276 bytes
SHA-256: be830c5f0403fdad67f099705c5b70e81120edaeef6e0c0a7e4cd4b821d2a300
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16800 bytes
SHA-256: 8d997840adfc5ce3a06042817397e5d10280a07fe3332ab1850a97d1d021a0e4
font_02_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1