Malicious PDF — malware analysis report

Static analysis result for SHA-256 d404771d2256b11e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 05:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7bd77672f6df50986b8e76cd42e3bbb8 SHA-1: 474622b7522a6c0f9baca0fe127eb518cd60beb5 SHA-256: d404771d2256b11ea09790151f59f54170564edbac31eb648b4d8c81a5633ec3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=youtube+blue+apk+download+new+version PDF link annotation
    • https://palezieux.com/ckfinder/userfiles/files/vakonenogaf.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a4e0c397036d2b454184cff4a7826343/rakakufakafawopogufozu.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909072752_075nil.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/ruzulofuvuv.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/388f7961383d7f750c1ccedf8fe56513/jegaropotirekamejezus.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e087b1111---vawolodaluwinetur.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/2489113520.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/96221603367.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/88915510319.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145180e7862c---87141411314.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xajobulofozuwavibexolapap.pdfIn PDF document text
    • http://client.diffuse.info/files/bobazapakexatitu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/xikiputaxebenanafuriti.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f950b1e0cc---49581088380.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/zivigofupojemezajitedovid.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/jakitilal.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/gonudotida.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109172054568671.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/berosanazulekir.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210914043346.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/vokuxogojolelusozaxi.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6137F3D929978.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 17956 bytes
SHA-256: 6f3ce0196e987681d432278fa1ea564f756e26065b4a83d00e8ccc010c4c2707
font_02_sfnt_off00013343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 10852 bytes
SHA-256: 36896453e885da1288370ddffd1a1c2c411c13007e3abf51002f188f1cb50d13

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