Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19e2c1d542a532e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 21:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6a0f40b6c4afe7d763cdd5b2de100fa SHA-1: ad8951370237e845a85549eebe1025ac74bcf463 SHA-256: c19e2c1d542a532e103bd2e6630bf3bde1e5c22a58b16d35646f39b38fb7a8ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, hence the T1059.007 technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=ny+times+puns+and+anagrams+answers PDF link annotation
    • http://chipublichouse.com/ckfinder/userfiles/files/82586124238.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712bfc74ffc---33439570604.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/36568103434.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/15b746c9457a50705c962c218ab3355d/19646221493.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd799ab2b---74127844727.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/zaliwewovesoxiteko.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/74111771344.pdfIn PDF document text
    • http://oris-am.com/editor_up/bidunaxovusekemerurozotol.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f2c7a737590cb106714e1e0b1e9e4ccb/zabamitokil.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b4377bc5d54961fb05bb2988c8cf612f/77773340772.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d531b871ee---vefeluvevuxizukukekibulap.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/49512123466.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/648ucppnntgpl32qcv1hp08l5g/52323875708.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47213d9c6e---94641420423.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8f03eg3hveqiir7c1allslmr2h/12572148919.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tupoli.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s1bov25chi6nd7bsci0p81k087/48636981127.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/40210749058.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/32129687929.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/sofevon.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be82d9d91b---32665708407.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/56847463258.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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 17036 bytes
SHA-256: 8b6bfd7cef8b69b40627e39d873e3901fa5f605c2fff1411892961d8509c8602
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10844 bytes
SHA-256: 70b79eae8acab79cf0e7a3bfd72536075bda0858494c613fb844f6aa26b14b79

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