Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c75386a303b858…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 12:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1503c33a19bb9f5cde5176012a8407e SHA-1: fb22f9e76c5b59e2061d28ffc3fb2fead6de0bff SHA-256: 58c75386a303b8588ad8b1efbb45cfaa2a0446349de535d5564f600414c698c7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly indicates a phishing or malicious download campaign. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://charterboatdeliverance.com/uploads/files/bimaz.pdf In PDF document text
    • http://chromavials.com/d/files/27973961250.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/37853537044.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/wedakalomo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c8f01083d1---sikaneravuvosikajabaf.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/64919284965.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e557de43fe---vofexekoforon.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d10dd38d---7221176339.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/wewojowerivufezutojud.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/ximeraxulemige.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e92bc49f5fb172deb1e237ba05003dda/95138894772.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/93615845730.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zakopesoworekekudune.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/16703655036.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/guvakipofezimojusepixada.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b740b727---defojorotuxaxemuzuvezil.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/57102829034.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/17328359741.pdfIn PDF document text
    • https://penzion-palice.cz/content/82401302979.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/butakagobogifo.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/80883484889.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305049af605---detegizodeseruvo.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/14321410568.pdfIn PDF document text
    • https://totounited.com/contents/files/94031307072.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e02b0596---93663016229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=space+racing+2+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 21056 bytes
SHA-256: 2dd0b0bb0b956460bfb652a72f829a05aeb8d9ecdaf97ee4ff639f0a0a43be94
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10404 bytes
SHA-256: 31b56c61a98b6ecd9494658a9e74f11a444785c8518336de65fee4f33b7c4ad6
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001433e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433E 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426

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