Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfb888759d16351…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 12:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eae1b0513ca61315d88694c54648cbb8 SHA-1: 39bd17390fad375e0b387c0a4c389f1fb9f1df58 SHA-256: 3bfb888759d16351842f615858a0a6718be9d1d1d458836f5fd13bf4a6d991f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://laborke.ru/uplcv?utm_term=ria+251+manual PDF link annotation
    • http://broadviewlibrary.org/uploaded_bvlib/file/kagakilalebud.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/df0046b383ac587508b6d2e7322ab7c8/96200900203.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f2586776---17316986041.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f90d76783---34563945709.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/64806459655.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/93663797266.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8c618ea9b26cb494743681be71aa6a60/dopilakebulof.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/24285135755.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/95118241681.pdfIn PDF document text
    • https://megashina24.ru/files/files/51587441522.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/622h06vfbnuh75g4h6onof5ilp/luxizilefawila.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d59bdc891---90236609359.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/bevuzizodemaxe.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4f4c6ed56fce3a0f03ae8cad0ba179b8/87562732575.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/lufafuxoli.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108160011411692.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1626147419913158783.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c689d9b3522---42572516337.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/98756826600.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/fixadojamufura.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/dokizovewer.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kj703siaecqqpjgqp0cscbna89/42192897403.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1kbef9phb7fjg1srgc6knfbs2o/begokaraxixim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 17360 bytes
SHA-256: 7522bba34ed85e31c74856030c4e236eb7c3b11588ed864977d0b91fc55d6e90
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 2220 bytes
SHA-256: c99d436dc798cdb5b8467acf1b49dac99b1e7a5f8acb05650c454d7eb90f6326
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10104 bytes
SHA-256: a90e1cb3b14b040c759c5889ad441c452920147ef3950ff751c1ca3efd1beb80
font_03_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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