Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5b9a5bf1419306…

MALICIOUS

PDF

68.8 KB Created: 2021-09-08 07:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46f4ed2a7251ad8ca32c01d7697e3cb8 SHA-1: 0ea0c0f901952ac43472642dca60c94a0c09c462 SHA-256: 9f5b9a5bf1419306d395809218c7b5e07ffe0b703db1a6edb723277097410347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://mecateengenharia.com.br/ckfinder/userfiles/files/42219931249.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a34dcd5cea4---zelut.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e148e2fc---82941089618.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/jujijisepelewamefiwe.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fa72eaec---2411041470.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/67668982504.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/nexaderoguvevijuzej.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03qln5vnnikeql4k4dhnusq2d/78959285949.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c4etf99smlt2lrnhp49sfkk7g1/bovakokeweburajepo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/doxoj.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7e5dcd93d0b9d78b28d07c106abf6d23/70894898414.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/regaz.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/zalovilirob.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jexibanogowadujuvotovuka.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9v31mh869rt4lpg9d67ogoqj1l/67259765446.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210708_79FA36505518A26D.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc86683f9c0---xogifaruzudor.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bepejobenexatakimisujo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/26em7bmf9hhtosp3p6ggktvai1/18610141563.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/siroz.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wunokoboju.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d74cc49de---malolokifabukusisinez.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/6988757449.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3c8c4263---jewifosit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=frases+de+uso+diario+en+ingles+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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 14244 bytes
SHA-256: d3a56345b56f9a1ad07ed87b6234d64a853379625e7b520c03b0bb14c75dfad6
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10652 bytes
SHA-256: 8cde7937926038ad8ecdaeb881dc4b9e6c8dd53bbc7edd426aaa9171921b0de6

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