Malicious PDF — malware analysis report

Static analysis result for SHA-256 3413a8d9c68ab52b…

MALICIOUS

PDF

114.0 KB Created: 2021-07-22 04:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 884d7ebdc4e7126ecf55991b38626a8c SHA-1: e830767944dfb8a3e9caef6e08e0496de92cf393 SHA-256: 3413a8d9c68ab52ba922dac956a1e8a20445f2c65fc5f84c8ee5af44798901cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c351389005b---15688254386.pdf In PDF document text
    • https://parfumzone.ro/files/file/walolowesenogam.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/tuvosoravob.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/xovuta.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d47db17487---sexajesusosomigu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4837be630c---magevofisofazipubi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/58395658101.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/64360120554.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/kiragij.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/51db9c9c3af7a03093f6ccc5257ae048/46994428743.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dd075b984819a21c8cd4acec5c4c2dd8/97771962647.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hp7ck5eh78sfj0aquuqa08jvc5/6854648229.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vkldlr0qmcckg20cbmmturbqp1/reloxabalenujulomu.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/kavilumebavim.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/sigidit.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/82105230650.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judiwedenig.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/06652363e74bb7ab4f53b7335b0b931a/robil.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///67412919694.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d61ba131e96---nabibet.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4679f03575---dotelibodawelirew.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2451c4b86c9d37149a454454148f9623/kisigekujuxusimumefeb.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/89497184286.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e563de7b1---vumapexipaxumakobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=unlimited+power+the+new+science+of+personal+achievement+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_off000158ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158ED 11044 bytes
SHA-256: f29c3fd7993556ca373fad8fce199404cd1c873ff0c7fdc54ca112724a600ada
font_01_sfnt_off00017274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17274 17536 bytes
SHA-256: 4e127be1e58ba72e193ed78ae57ed46818e909e7412b88edb4260fb5bf92d253
font_02_sfnt_off00019fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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