Malicious PDF — malware analysis report

Static analysis result for SHA-256 b372de4c24f61bbf…

MALICIOUS

PDF

108.9 KB Created: 2021-09-03 17:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0551dca32e93305ecc66df16e8148163 SHA-1: 71176adebef27966f23264ed75bc36dadda13f66 SHA-256: b372de4c24f61bbfd4e77ce066928ad72650f89101e147c366e733afc06732b9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sakaryakasaplarodasi.org/userfiles/file/dejujogidilaxozo.pdf In PDF document text
    • http://tajeer.co/userfiles/file/zikewox.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/190246147253.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/febujugapaniz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5dd61e1a9---35956864830.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/43568316033.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be59606c5---19565297301.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dusiluvedod.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d8b2758ad68ea41e0c2f9c1f7bc483b1/wixozoto.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/92015755468.pdfIn PDF document text
    • https://emmaushuis.org/pages/35966998761.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-12/20210812103329296819.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xafuz.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6b6638b03---pokodowirifije.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/tupizijolutefevogegeza.pdfIn PDF document text
    • https://menu2uplus.com/images/file/76992127915.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4de1dc5e---18541958305.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/24483077445.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c4c1f3cf1d5126c3b3a22f9b37c7e597/26040178481.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805e616355c---zoxomevufabosimataxew.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gejowiwaxuvasanojasakebaz.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/juxafetobugivuxuwineni.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/58624607685.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/80456986741.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/97786261272.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/7923589105.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf91b4182---66662216388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=double+consonants+worksheets+2nd+gradePDF 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_off00014425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C37 17720 bytes
SHA-256: 0f1c6c9bf20e87ca799211b9986a70a93cb8614dbc5d742f5be700f65232e94e
font_02_sfnt_off00018a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A33 11096 bytes
SHA-256: cb15896af0df61045b3758d8ccd3e8a0137894ae38010e2433f44fb1562516da

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