Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bae2af8cdc2410…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 19:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a205ebe41d2a33466de053dfeda4124 SHA-1: d1552f8c72454873ecb43154abef42a090d443da SHA-256: b0bae2af8cdc241050677d1e7c8105f195fbc5d7def6089ffc1bea132111ce9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of link farm heuristics suggests an attempt to artificially boost search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://henzefashion.com/userfiles/file/zozidekatiref.pdf In PDF document text
    • https://sedefartphotography.com/resimler/files/18310321725.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagesivo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/69994637158.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/23285149745.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a98c97c30436316fb37b5c7bcc83a482/jasizuxifedosuzun.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/24283305232.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/7221323626.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/84607530621.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ada38cf64---96630788180.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210911124657.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0a3ae071---rudunijiriduk.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cul4r5pmengg8m6jk7dlek0bg0/piginam.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/89106567347.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131650cc511b---luvobetaregarobagex.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/80938816438.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/11383103164.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/51607441517.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80822441682.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/zezenefokipipokixupe.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/73206911605.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bbac997f---83433078521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hill+climb+racing+2+mod+apk+unlimited+money+diamond+and+fuelPDF 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_off0000b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 15328 bytes
SHA-256: a82221852730d9b10761df778f9bc253e6bb8725aba212d10d9c944e413acd5c
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 11352 bytes
SHA-256: 09f0d64e24de426e37e7248878d160c91ac5ac710433eb95750566e92a9288ba
font_02_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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