Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3b1f38c374e46f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 00:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32a7a67f1d1aadf2f09f70464d7a3f45 SHA-1: bde848fc309e3ea92bba7ea97768763c528c9669 SHA-256: 5a3b1f38c374e46f8b2ca4e08282d14a768e7f1cc9a54727b0f049d66bc15c5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://akvanova.ru/sites/default/files/xutukepuko.pdf In PDF document text
    • http://www.sport-konyv.hu/userfiles/file/naxefonedopuruneba.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/82339902831.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd3270c99---46199254687.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/8404411083.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/57836827094.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tijedaxafasimudek.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/gavesagobe.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/fulogixokosuvevexiti.pdfIn PDF document text
    • http://strahyi.ru/images/file/37745782059.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/dijegosapadibobepulasiw.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/demidom.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/86893626806.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/gevakefadunopaja.pdfIn PDF document text
    • https://maisonforville.be/documents/file/34814152941.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/jasapek.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najenaxef.pdfIn PDF document text
    • https://tcremich.lu/files/files/fumutedopipofepevabeve.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/70600048044.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65281998349.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a44f92e67---93414777643.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wumuzafom.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/navano.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/darodekedavesanowila.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4857d65ca---72244136210.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jimas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fast+and+furious+hobbs+and+shaw+full+movie+lk21PDF 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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 18060 bytes
SHA-256: fa7b9561a748be89808f751d82563ec82e58da22101115953d3aff85536656d0
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 11252 bytes
SHA-256: c0efba748291faec7a059bb1c9e3b34f1984325b7bfe6c10ad2ebeb5fc263e90

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