Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80a65840cab9ed9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 08:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a0911c535cfb4df90979e8d2c61b807 SHA-1: ae970004301217a8a13b20dbe78b0aef29729884 SHA-256: c80a65840cab9ed9d33b7814c68da700b45d601c71cd52d37dd557f023c7fb25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://pravkniga.ru/files/userfiles/files/kugogadun.pdf In PDF document text
    • http://macierz-grodziec.org/files/file/32395517278.pdfIn PDF document text
    • http://orthodoxnews.us/file/58544165859.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/fijixedumelanirefaxoz.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/vujapepuribapegigavaxufo.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210904010741.pdfIn PDF document text
    • https://nasikampung.info/contents/files/51040179064.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161352a5ee617a---74207888147.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/tagobipotojamibubezibut.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/5748498781.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/42459276010.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/92276000958.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/jeviw.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/latalitijopajafurife.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/74272532411.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109062312092507.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b757a1ef7---80094366500.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/tokuzadexaga.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/38074584121.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/74505968994.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/doxetulekitigufemaxigut.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jupofadukowijer.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/metepikibutida.pdfIn PDF document text
    • https://polaria.cz/images/file/57611375601.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138291196adc---33658548347.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/10628364333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ez+cash+hack+unlimited+coinsPDF link annotation
    • 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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 18296 bytes
SHA-256: 6eb12b1d2f103909d865b9a2393e1c40d402186aa6e65d0e96c83af019b30403
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 10772 bytes
SHA-256: 127435b6931f0c3f7af4af2686607291b6f21221b13738d036438d367082d300
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1