Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c099a4ad9d42d2…

MALICIOUS

PDF

100.3 KB Created: 2021-07-18 10:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3110ed2780d731a1cffb20f1a7fccfb2 SHA-1: aeb84d5cbe8c1c32d97aa214d1bd7a0b939db5c8 SHA-256: b8c099a4ad9d42d2c893020ec053a0cae25cca308f091698d076880015cc2948
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.77ice.com/upload/files/pefanonokananodexuvune.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522164400761564.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b53f554---11087934091.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/14446208313.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tujomutisudakafol.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/tuwuvumuvinez.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88f28cfc418f45b6dc38d4a88ba1cb80/vugumavuxena.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/87ba1b8bde0554fdd4137e838ef61e48/1293161958.pdfIn PDF document text
    • http://www.toptehnik.si/images/9071720585.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/fa78abf650ef058fb3915152d9af788c/23312495612.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2f691d65962cf7fb26a86349fa4cab94/pebiwepabefi.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/g3nlkro4cljuhnqra9cg4rg33t/99521956036.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5uujr3kup09q3cspm5h5n1st2c/26395573800.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bf5e03b7---zetozojub.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gafagefenije.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/51671821824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b2c86ea57---duxumam.pdfIn PDF document text
    • http://simonide.org/userfiles/file/68630907571.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/68472393516.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/87592654448.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mofixatalanofudogonagusa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/89968175229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=energy+transfers+in+a+torchPDF 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_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10668 bytes
SHA-256: 9fa1f9a255edb6b55135142044f9f483153799c6b5636fa0798c9a900dc48a4b
font_02_sfnt_off000155a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A9 17848 bytes
SHA-256: 6bf0f819a1cffb54bde509dc899537bace4d46b6be6ab8d3b1085b5c44bdec4a

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