Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fa101a7fea5585…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 12:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 472ea06780703cb38a3162f374b9c0fe SHA-1: c211b00e0398063a448f1c80f7030981d54be55b SHA-256: 43fa101a7fea5585b2ae4680b0c1c5abcacd2f070a54ccb6757e4a27230a039e
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 external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://philabc.ru/uplcv?utm_term=substance+structure+style+and+the+principles+of+screenwriting PDF link annotation
    • https://agrilaui.com/userfiles/file/gixosalitisanenududil.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/roganude.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/jedowozigabogorejuzi.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/riroxemakikuluteja.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bidizuxakokewareparuxefu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/76514015171.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6835cb45d0b13d4bb4ee57b7e252b4fb/zasurimuvosupanikek.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/j9cg2d8pb91om92ppt6kagi0f1/38508187526.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/71d75bc8b1d5ae876760e14cca4e0306/nawinikanule.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ab94daeb15731d1632cf0a0cb5ad77a2/jotuvudelepajepuwosetu.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/xekepezul.pdfIn PDF document text
    • https://onecre.com/images/content/files/nagokuk.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nogesuxiwoludeja.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/hrtfbkivae631d7lc0h97l908d/92816807843.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/xomafilabidodigiro.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/aded449b1dd4472606e0d7b742b5c921/zogagapeta.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd32b0edfa---24520804655.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/mimibufawitakepiwe.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf306b4e---80400617956.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1ef4fb80---limizetelorimuzadujosevav.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/lijadesiduzamokax.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/mugixiwigikizirebezop.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3202a5ac0bca23de0b684e5461f529e/6256517739.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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 11416 bytes
SHA-256: 859a0c061c2794858fa95288ee8e7f453a6b7d432507df059751222f1faa51cf
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 15104 bytes
SHA-256: 576087eee270ae47e10666f88d71b078cf8db4751270102b8f660c918e08835c
font_02_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.