Malicious PDF — malware analysis report

Static analysis result for SHA-256 4435e0a58a48a0c0…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 00:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef8500fa8d774652c3eac0e1368bb1a SHA-1: dc883c676185ac42adc9b736809ec2286f70f67b SHA-256: 4435e0a58a48a0c099855c958718042e854f85b272a86ffb4eca06b7372c93c7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to domains that appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baugeraeteverleih.de/benutzerdateien/mesilakejuxibubepasanenow.pdf In PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/sozudumizewulem.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3701c448d---divufizuwawisufavosawoda.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/36673213267.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161403fa750bc0---37796470811.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/50365423486.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/55068901065.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/rikiwodugukoja.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wulafuvamesuduvexesaxi.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/97906012249.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/97799458064.pdfIn PDF document text
    • https://denimder.org/resimler/files/fifutujidebon.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fakorefakajukitaruxexa.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/90288182726.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/97590358917.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/53113420025.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14992293307.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911233128.pdfIn PDF document text
    • http://zgic.ru/!upload/files/88134006385.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38645dfa3---39957057752.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161460f0d3c016---37124552357.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/98282127129.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/kasizekoko.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/sevezite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=3+interesting+facts+about+shakespearePDF 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_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 17464 bytes
SHA-256: bb288e07c1a0d1a7e1e6ad16858da5f6495576be44204522bf72f05d4eeaa942
font_01_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 11120 bytes
SHA-256: 55b67781d2f9b6e5e23df0ff348f228c0a5c92c42b6d6c743864f52c66d6ff20
font_02_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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