Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f031e682a8dff34…

MALICIOUS

PDF

93.5 KB Created: 2021-08-12 07:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93322b915bc0743177199eec05553eb5 SHA-1: 78a3d004d4b46d7f00157950f4f928dd6be7d25d SHA-256: 1f031e682a8dff3487a8b829087b8dc81885a5b0f7b210bf6f28cb1c01e6c952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that often leverage embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=what+is+hemoglobin+buffer+system PDF link annotation
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7aa4ad46f422d6dd29840c7dcef20ad3/zatatoviremijosolo.pdfIn PDF document text
    • http://learningkey.org/userfiles/tafumatitupuluxibegefelo.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fuvifuxisudotuvap.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c4cac463---bezedijiwurinujebisex.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae353e1c47b---37778082861.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997da789402---dogimikojumo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b094d87bfe324a20292dd88a3edeba82/nerox.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/62515565010.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072757f3a7ce---tujenirogodupelo.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/ponux.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/89241591807.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/opitvstj4j179pvk8f4fol9v25/winapuxivifugibajevikobu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742714ae892---zozapogatutef.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fosobubajalivalupuj.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/bunekukenofukumigiz.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/3478920229.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/491060920.pdfIn PDF document text
    • http://edgecs.net/documents/kuvini.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/tavewezoxofuxivewe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b0e047b4---mumabavugikugewukosawemu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bf9a5def84e49db201a76e3645f8e500/fovixiz.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/64008203829.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f987cd6c98---68046367057.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7e03cd630374f73fbba6671f02f63560/99260126580.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/13573623121.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_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16728 bytes
SHA-256: c6a408607e8e5a8eec13035186f15f92293d63c12cea214930958c36338ff002
font_01_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 11008 bytes
SHA-256: c3f0059de6ef4d19d46bca72ee13474522618ed716b641e63c0591756cc48ce2
font_02_sfnt_off00014ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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