Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f1526dc3560990…

MALICIOUS

PDF

97.6 KB Created: 2021-08-13 04:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98ba7da74c0145bcd3161e88bd9abec4 SHA-1: c5b4c324e972865712cd89ab0d5ebd9794626e2a SHA-256: b1f1526dc3560990bb2a285c5783477c756ec4ef06a616fd654fe930bb71827e
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/suupif6l2hupq4f4kpoj52f1h7/95823479111.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40c9g8u10vio60ftvfjjtdscr/tefazaponikebivasap.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/zonaw.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc98ab300ff---50804674672.pdf
    • https://aslimitada.com/userfiles/file/1518938516.pdf
    • https://mfdesign.hu/files/file/baborejubisinevikori.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e1f6vl862d1skahu7hanutj2r1/fanekeguzorosuj.pdf
    • http://alfavit.tv/userfiles/file/tevinofowalezabes.pdf
    • http://musicpark-live.de/userfiles/file/gedoko.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8n7knu1vf95sracbhjeo15pjr9/basajizemaxobu.pdf
    • http://studioambienteterritorio.it/userfiles/files/tebomuxetigowikakawugamuk.pdf
    • https://vanvoorst.info/uploaded/file/13441181846.pdf
    • https://myclubowners.com/userfiles/files/batefonizufe.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/ruwixebosa.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cd4c78f9d---luxok.pdf
    • http://sakem.org/userfiles/files/zuzovanusuzoxavevapero.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/81866636366.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5195716f0---42754289491.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sbf1bphn7r7aul62rug7isudf9/garujubevirodejobaju.pdf
    • http://esrafisek.com/images_upload/files/61449421645.pdf
    • http://mientaytourist.com/uploads/files/pazosifalabufibifuzuwajob.pdf
    • http://zulassungsservice4you.de/bilder/file/20265592624.pdf
    • http://excitechem.com/userfiles/file/55613005134.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=warhammer+40k+tau+codex+pdf+mega+vk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001125d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 16792 bytes
font_01_sfnt_off00012a74.bin
e64936d15ee38fd6277a362fbe0854de6d5e0fd09babc0f44a6040b056e2c7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 11208 bytes
font_02_sfnt_off00014495.bin
8a8180e9ab0d3d76edc9276f8d9860309e9597a158ab3b0534598b66a1711407
pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 19720 bytes