Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e182dbaa53b3ea6…

MALICIOUS

PDF

113.8 KB Created: 2021-09-03 18:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdd0365944c59d94617fdc9999b7418b SHA-1: 9f7618065fe39304698c36255a27c097ba105606 SHA-256: 8e182dbaa53b3ea625dd8503ab728f390aae76df5df11ca0e8729834088a0495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://infrive.ru/uplcv?utm_term=testamento+vital+en+espa%C3%B1a+pdf PDF link annotation
    • https://lotteppta.com/beta/assets/file/29472060909.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/67497215009d0c996712c1053b39d2a7/ruxagixegenonit.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2eeaf380---wenebonepovuzuduki.pdfIn PDF document text
    • http://patroha.hu/file/riwesanoxum.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c06378572a114e8f20d9a85172ea9cce/15682657462.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/8173780900.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/20857563110.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mccsrucqrqp8d6089ilnr7ntv1/dexemopedesujutugidizevu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043e326381---26607666851.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/84181865239.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/88b98270770a22122a8b725ed9e432bd/67474281160.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/12253189871.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rsinaetvfj1gf1m7jvm6v8fjk0/lejekefow.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8999991f6---nifefani.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/58081272920.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/68353497818.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/704a94a5781b221028d98f2a4b6755b3/fijubunejoxarevewiwana.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/62301660053.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/daf7cddc52dd2cfa8881642ddb41fb7d/fotakominipusebepu.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/52967186600.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wikekir.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d5ed0b3e---medotulunenewuduzoro.pdfIn PDF document text
    • 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_off00015430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15430 10792 bytes
SHA-256: b2a38965c7928d684a814b1ac2c5c91e9d573ff02985fddf90094e6f6fd7889a
font_01_sfnt_off00016cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000184e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184E6 19900 bytes
SHA-256: ec03e449341c61f6e3e10280ab17dcde362e0eb13eb3b6c5d49db9e9efa3d4c8

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