Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0b9db7822f3414…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 02:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 751b1a73c814f5200f2c2c9dee49ed9b SHA-1: bcfcdc38cebc36ae552be51189f1aefdc012f220 SHA-256: 1d0b9db7822f3414bd0626532f154879b7619aa9579d6e6c32d908bedd689e69
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=manual+calefont+splendid+master+10+litros+tiro+forzado PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/00b35cdd23496b23cd50e67d0bae7d32/nexorefenarokanud.pdfIn PDF document text
    • https://emmaushuis.org/pages/51791840585.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c1a0eee8---pufokow.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747bb08feb8---kegeteweris.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s11jphu9f6e6n7qhko2evgevs0/8024187428.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/77a7a5c8cf7349fcfc6d2c80127201fa/nelexonotix.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/welunenuvogelusifuramop.pdfIn PDF document text
    • http://www.moyekolodin.com/files/14148481716.pdfIn PDF document text
    • http://ombs.ru/uploads/files/saludakobul.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/wesabitivuweterug.pdfIn PDF document text
    • https://famecosmica.it/file/kulur.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/kidejimemutulosexe.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5a8d1a17f7bc15c6d2795d0fae96af5c/33564860126.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/mowilanid.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210612084827335.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fb90e9a08cb2981d3f9eafad2714cd70/sorutipizosaletukape.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b11f52def409b7d9420091a2b5d3deed/tolepolibodemedoto.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210603_ED90F49BF3EC2748.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dd75305e---11537225128.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac2377917---92826000237.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/578005ed7d27edf8a891caff59b789d5/13328529189.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/197331472660bba7a84f033.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160726c93449b6---pelegewejotatiwife.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b3dffcb2cbb0af44a837f79c63020aaa/58797562515.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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 11108 bytes
SHA-256: 6c63569328be1787e5ef810ae2e2daca8a30d01405a9e581279cf56b9c0cd62a
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 19860 bytes
SHA-256: 47a1df66894bbfb2f8ab08b843d5edbc3f1b7146d02fc2b503f83a4585e8814b
font_02_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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