Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0a978dab078229…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 03:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c12f0511662030efbf8860994fc838d9 SHA-1: 42883d328c87679ddd81ad68bb05430d6373240f SHA-256: 9d0a978dab0782299be18b38f2a79367013b5958abfd5e9ca4bdbe1d5cc66b76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to various compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to obscure the ultimate malicious destination and potentially deliver phishing content or malware. The use of compromised CMS upload directories is a common tactic for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/96364bbe4cb5c0f0943af6abdc9fbaba/pugodisovafufurewelaf.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a75aab2132c80dc4798821d041ef4553/gamukopotukuzu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/746299a4a51967ca47f5856ca2d941c8/xutedino.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8roi1jmj19pae5li5vn82fopdl/mimudajirafadez.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167f8adc5b---sawuritomexejirozojoga.pdf
    • https://ukmalayalamnews.com/userfiles/file/25147817711.pdf
    • https://audreyheselmans.com/_files/file/20121340054.pdf
    • https://fetogram.com/images/upload/files/weguredugituvuxumor.pdf
    • https://bor-diing.com/upload/files/dubudi.pdf
    • https://kidneystonetreatment.in/userfiles/files/19183726944.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1354564cfd---toxogepewipamosuwizis.pdf
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/lovadoxelizotatowig.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7654e680---zunidimuwidupe.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/539ad4ba4c5c9022d791fa6ee2544aaa/15671237318.pdf
    • http://doks-films.com/pcms/content/file/womijareloruseleriguru.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ab98dd3efa142046378674a8164f628c/68083118642.pdf
    • https://rkdestate.com/userfiles/file/22131084344.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/rozarevazeboxisuxafo.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd87b051bb---37448385633.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6ba89aed64f610b33b8a6680a8567e63/lekosezizobemapuweliwefe.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/wapelolit.pdf
    • http://beveragesgs.com/userfiles/file/bubaxoxapinemom.pdf
    • http://salkim.com/userfiles/file/91698051670.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+it+right+to+pay+tithe
    • 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_off0000f494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
font_01_sfnt_off00010ca6.bin
5f87e207240a82ce41f7174833593a6d30e8dc19b82aed7ddfbf4b037e3e3a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 17188 bytes
font_02_sfnt_off000139de.bin
bf11cab06a8804cc9af03ec4c78b3df2b2090c4a2b211ea612f9af1699926634
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DE 10448 bytes