Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26e784e6c313b6d…

MALICIOUS

PDF

75.2 KB Created: 2021-08-28 01:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d91572b469d6c8923e46a146a0acc81 SHA-1: 8311f516a2661a6b4e78fa44b2a3ff6f5bd6c512 SHA-256: e26e784e6c313b6dcf8efa43596214b0d5aeb35bc94065d744b0d4158d0afb21
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the presence of many external links indicates a high likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=app+use+to+watch+live+football PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a2cbcdb301b895f96568b90309facc0/puxidobaxapexet.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xetenewefasewujebixigexu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c95068b1---pefemidolija.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/xesupuf.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/483244750.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68b850e51---lenuxorudeki.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/vilolobifuwivekeg.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/3a678e31fac422fa9e711d23ccae4ec8/juwotil.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cu0eiqq8qlbhrnv04jejt3gom/85518680354.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/37706671611.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/dulubasavalen.pdfIn PDF document text
    • https://aneri12.eu/res/file/91866879260.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e282a803d---weligifudemurizekilokum.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bro8utq3luvtc8mik209hd1t9t/dopopobonemaxibodaso.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/80465831550.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/84151335166.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e412b540b---dovixiven.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/migadunuv.pdfIn PDF document text
    • http://carszana.com/image/upload/File/41641441736.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/tefuref.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210713045813_ra9ams.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/pafor.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/43707868171.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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 16796 bytes
SHA-256: 00162a70f6b0110e04250f59e2ff4fd2e7f2724d7768bf78c7e81e6c01c62e57
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10748 bytes
SHA-256: 8ef9e43629de31d7c560db785c8f50a0db29e8157fd730212a5fb1bcc7a02d80
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1