Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f69d60dd2a7fbcd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 01:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f72d58e5974163db7c1398aa70f19450 SHA-1: 81be7e4c37384a5bcde8d73ba6da2f447ae2c15d SHA-256: 7f69d60dd2a7fbcdcb5e27600ed1126a4cc801116a410c8e4a1628ce93bf4835
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to redirect users to malicious content or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://rolcsi-bau.hu/userfiles/files/5139280419.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/aad1c7bb5e798281a6219b439451386f/ruxamowokinonej.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/87245190623.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/40561201817.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/lafoxiza.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ocoeu7g2onor0g5nmcs6bhm410/rorojamobiv.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/kepakafategunidu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/newuzosadexiwipidexij.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/74554126931.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1jvalb451thf9n2p67u9cbnr67/30901750497.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/24523326943.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/82649736364.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/zagabizod.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/56637184590.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5100bb891835056a939c761bbfb716c6/gulafulimupewufizase.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fd99lbnl0pcfbbg91uuovbl7kc/90897333936.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202108250908078941.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/bikavi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/podajupikizujujanetuja.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-13/20210813142935867675.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161209d5b0dcb6---7052298990.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/vubadutov.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c68344291---wevonabagowamimewa.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/xopeleziwolepewasazidap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=printable+gastritis+diet+plan+pdfPDF 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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16792 bytes
SHA-256: a317ccb7f912dbd58774a8a0d7ccfb806166a88e74878dc6f51af4a34e7f88f4
font_01_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 10696 bytes
SHA-256: 51157d6d34b6605e9636e2418f4cb38a35cd8372096529ce37b7125ddbca9fe9

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