Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5cb432b2778b55…

MALICIOUS

PDF

79.4 KB Created: 2021-07-28 12:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 811917f0ed58ead554de80d494fac014 SHA-1: 0462e267e88195970764215b3067d9a3fbde4ea0 SHA-256: 0c5cb432b2778b55252f4d5c0c843ef4d29da48e4f7ea199dea1c30d5b552a33
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised CMS uploads and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these compromised sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be144b4af4---tuviwawipawemanezaw.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3d83fdfe1dff16d9650d490247da6841/28632239442.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xaveralu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608289086f87e---kesubexidug.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/ferodekabi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70cf5d446---zizodapaweguz.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/vajuzewiximajikar.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1060d196---vifajorebelis.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7525d3204528216e374d49f60cdb524a/pabanogukavir.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e881f0f4881e8e7a52de766842d408c6/ribedivofavenetikeg.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/perum.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f804a90feb---sipizuvaju.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/jodazasiv.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8235e5722681d95971fe3556a460d395/gelamavula.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa58bcbe2---66221235535.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gefigeteno.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a4v2utjjpcqvnnh5jc13cra0ev/99651720526.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/52ll9vgpipj7oseou66njaahd7/vebeboxexup.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kawapokenisupegefage.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2630_20210722223117.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/gorugawaxerametofopujex.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d51d766486b7d589a55c91be840f8392/66295157206.pdfIn PDF document text
    • http://canadanur.com/resimler/files/vejonopajudirupudad.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/566a8b4b1d66e45a591ed8b87866ca19/82809591555.pdfIn PDF document text
    • https://anaksemut.com/contents//files/xanawufada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ibrahim+tatl%C4%B1ses+yalanm%C4%B1%C5%9F+mp3+indirPDF 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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 18632 bytes
SHA-256: 35614f2c8a2ea196af31bc8e49dad9067247029775072d61f58b4933b3d78fb1
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 11204 bytes
SHA-256: 952f074107e8388b5793eeaf6f19ac90a2181437610fbb244f981cfd6d9f4cf9
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1