Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b7473e1c981339…

MALICIOUS

PDF

101.8 KB Created: 2021-09-02 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdeb1be5ed7d4f5e4848e31255a17b30 SHA-1: d62d47bffd6590a43288bf04ebb576afc1eb955c SHA-256: 34b7473e1c9813394c7d5dfee6e70bd350594d25a9993963b639bf9ed68bcc8c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and the nature of the hosting indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/v8s2a6rommbamifb5n6mto1f4h/49684470859.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/36758483804.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/zujilesa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ace140c3ca---riwolobejovowopizagogebax.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/mujejelumizisadirenod.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/54447519255.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8442a5aac64293c812d34870bb0bca11/14171469773.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/82181585343.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/guvumopezimulejogatesi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d44d22d9bddaa5fb061e57700f5aebb2/68534986741.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1e5485ec---jeraxubawevetugoramot.pdfIn PDF document text
    • http://recviem.ru/img/upload/vijelej.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c1ccd3a77a426a45d108d6ac46d7e4c0/75692528763.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/28460666195.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/votoxekekizetiturobup.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/jerorurupugosomaxagub.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/467ir0iged4dk6jsc4k48rpgif/sosofufefobagisamemase.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c9279348---firijupekixofe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c1be81ed1.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/af59edeb197f554b77848cd675140e7c/28665788462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=email+marketing+examples+pdfPDF link annotation
    • http://medlab.webd.pl/upload/file/10414647991.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 17216 bytes
SHA-256: 6b06ec52853912b5d56b28f62ba9c229e0ca57164c46aefca0c6ff226e06d5bb
font_01_sfnt_off00015892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A9 10900 bytes
SHA-256: bcf23461ae97729c4861f9ae29b97920558313bdda63d0bab0fdcd0f3631d113

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