Malicious PDF — malware analysis report

Static analysis result for SHA-256 81188a159327a070…

MALICIOUS

PDF

93.9 KB Created: 2021-05-12 19:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 160b00f2cec96b42266a395ae4d9f1f2 SHA-1: a98e88fe20e47a78e3142955fce37f9e22dc7f34 SHA-256: 81188a159327a0705b1e285322f073785e679fff8bf13073b536229d55996a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of these links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f6e6c5eae5a58032d4944f562ee26f06/rodofumuxoge.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cc780efd---lojujuwebufugazoku.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c733fe072c---woruz.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ba546f2c---zoragoso.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/e27qeur9sdtnj55o0ap4rng4ln/47943292775.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/lr52460v51lngj45voda7agi53/80202599795.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/94351703828.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160983e0256876---58179411075.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pozegarot.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2nbak2g5h1gaaiemi6pvbla5rc/tuved.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/poku19621hnvkhbd9msp1slptg/16351158616.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e06b2b5b1---zivawigitowojuwapano.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2616fba7cab759549eddca8f2f2332f3/detebujananukanobu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d548b57af6---sonab.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6690b1d04d380a8963706be968ae1aad/xiwekimoneseravibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=caller+id++karnaPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cc7e1e8527b91a2663196ac848af1359/33180380257.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 4612 bytes
SHA-256: 6228fbd000db5aa19bddde623adb17ea316227ddc0b1a1526a89dc680d248f1a
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 10004 bytes
SHA-256: d0ffd16045174904069403bbe491985fc7c345f1d6f73dcaba75cea98655a834
font_03_sfnt_off000140fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FE 12936 bytes
SHA-256: 3c7ccf4202135887460ebc3305ebf23e71f5662352f0aaba6fa853d8142f75a6

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