Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ca879bb08dfa4d…

MALICIOUS

PDF

90.0 KB Created: 2021-08-13 03:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 23738b141e68becc7ec0bb03627647b5 SHA-1: a89a44bc8b4647efc8635f46e022a502062ead15 SHA-256: e2ca879bb08dfa4d1edaedecd22b5bf555a061403a9d29e31e999c68b57634af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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=west+bengal+government+6th+pay+commission+calculator PDF link annotation
    • http://spalovnachemolak.sk/userfiles/file/wigutulefisufirofiguwali.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/dvikhkit27h0t2acemfddgt3la/72362309694.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/78700955106.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9c55d0711dc21ebcb956cf9c96396cb2/17996946888.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gadlqh5oh1s4q6b6lj80m5m893/fipoxajejiriko.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ae1d0f2b6752656b68acf4bf75c08f1c/21830218100.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/mupopajeduwisekirimase.pdfIn PDF document text
    • http://amajyuku.com/files/files/43816810255.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/37223tihsd9oak70h48hos6cn9/kelesapiduresozux.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/salopuzafesakow.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/99524393582.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/tafopuxarulopuluburam.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/88539017775.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4255eb70534a302ec94c3527bcb0e57a/77128759878.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/bugitelopawaferu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/2tjd5bsp049qbp8g4o341glu54/53183442755.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/rixibunivalizifaduderal.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/22852770951.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kakofukusew.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2695d3b32deba9e4c92df0544ecbfb45/44592495017.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/mn3kmj0fgoq38phpuoid5huemb/6130390477.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/57995100155.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210713_48FEEF5A3C4772D4.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/89361652127.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dm0js25lckufhq5eq2l91r5f8b/fawigubewixegegitekopifi.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea56d1ce99c6c7684afce484c776026b/tudunexisujasipemi.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_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 11404 bytes
SHA-256: 09ec570cfbf7d4d80656b322a41bca58f8096ed0fb7dd2e3d0c1242c67c7e4a1
font_01_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 18140 bytes
SHA-256: a73619ee99dfdd9fe411f59c81907fa14daa098006a2e8fb92c08adf02486103
font_02_sfnt_off0001407c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1