Malicious PDF — malware analysis report

Static analysis result for SHA-256 e877064d6bb5b1ac…

MALICIOUS

PDF

89.5 KB Created: 2021-07-06 22:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f087b2997166368d9b165bf6724fffca SHA-1: 58af1502f4e8992764477c32376a511c63f46709 SHA-256: e877064d6bb5b1ac2f0a37a3424a85ce50bf1ea1ee8e0b3ad1ffa9bff44ab02c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rotarylaspalmas.org/documentos/file/lokezu.pdf In PDF document text
    • https://hoavily.com/uploads/files/65125407454.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b6e999bc6eb088099f484ea63530b6eb/lenubozunawitixiruto.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bbeb642e---dugarekufuvide.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/bd78e14a872486b4a21bb595eba69419/46920251106.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a069e25fab0fa23e012d7343b288a495/dodavomaxekigofuvixawenan.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c2bee5646f55d492a30eab8883f8d0c0/78500187451.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505220501228308.pdfIn PDF document text
    • http://askort.pl/Upload/file/31723605443.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/57716676162.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/48174791688.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/t5elh6th5lulhvs8ae15qlan6d/fumovurek.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210626210749_da69eu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27680d0f17---18656164236.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/vafuzuzux.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7ln4qo46hlgeqrdcjidl2p6jp5/84817124273.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/79700683615.pdfIn PDF document text
    • https://bloomeng.com/uploads/4162723627.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0mtbkasm5abgvo6uiguhqjdhr6/jiseruwigabadifujelas.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e89903eaa039c79881ec7b9cc8f11cac/fudokovafewipekatozudap.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/p74p8deurh92tlkj0tl5lclji6/18104677267.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adc73c1ee42---siwiganorexurelelovekaf.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/danawezimulorufi.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2836e204c4e2ad783e6dbe3ed2a9c666/77273832985.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be404e62c7---44441727693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=becoming+the+narcissist%27s+nightmare+free+downloadPDF 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_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 11096 bytes
SHA-256: 77834667abb0f78c96d1c47946a581d098779025414578e3874deb1326241e2a
font_01_sfnt_off00011466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 16800 bytes
SHA-256: d1d94d33f705a3f5a9f01ae29e0f7626e7961147fe79b80f94a841fe95018a4c
font_02_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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