Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd8103754183177…

MALICIOUS

PDF

90.1 KB Created: 2021-07-18 18:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41a01ee827951980a354194558d80ad3 SHA-1: cae7b7c76c56a0334b5688f852aec0f64d6c2a79 SHA-256: 4fd8103754183177752453bfd74615f8afaac1477e956f6e6e1bef6a91b6610d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://thessalonikiflights.com/files/files/99680682371.pdf In PDF document text
    • http://01host.ru/userfiles/files/38123763539.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e786aa6f81---bopag.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/a11ai54g23guqjc3u8c9mrgfr6/tawilul.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/24685175416.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5b74570be6edaaa1152bd64a7f6c1ed9/15467617723.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/51543513345.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe47542076---64087737088.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/c97cb8q5015udcc4elj2u6tcm6/25275720273.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e6844c23f2f---tezufodebuzaveje.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaxolemipibup.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/nuxebozulikijamujali.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pev0hivt1r1m5flr93oinkftq7/1294324164.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/sereretexedinezosok.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/256b9dc5ba887c7460dffbece42edecc/55145983251.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd78f8b8ef---fupapojafoj.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc516b95f5---xitunezax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf55099194---58843913752.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/zebigafapewofezat.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71af236e6---72244277898.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098839f21de0---39157577607.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/firovadame.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160981fa115290---1291980212.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tp48mnidj07lqda8ksf4md7evr/siromebiduzisisudasogo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160865d0a26196---98034934687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fish+colouring+pagePDF 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_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 10632 bytes
SHA-256: b70384481366cc6a72d30aae768481265d272d6d950fb17130d5aa0b1f798a53
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 17132 bytes
SHA-256: d0d3e67e9facbf9bb4929d3848ddd70fdf4e53aca835617c262b492d112b9b55
font_02_sfnt_off00014316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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