Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f15ff53bb305faf…

MALICIOUS

PDF

106.4 KB Created: 2021-09-16 12:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35a05a884c024d05e03d4aee5f6d9e52 SHA-1: fe5e9988f4f3b3153e17661951186495c1c4b8eb SHA-256: 5f15ff53bb305fafaed79def7a0f8aece1c0a68429ce154dc9e5789969d21342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised WordPress upload storage or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a lure mechanism designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://pixomot.ru/uplcv?utm_term=the+three+dynasties+of+ancient+china PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/5974137039.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mofutomopodudosisuvo.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/22986096009.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/7582773381.pdfIn PDF document text
    • https://ghnservizi.com/file/90276541348.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/68926406235.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142edd5c9d09---71184074019.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/gogunafaluw.pdfIn PDF document text
    • http://amdind.com/userfiles/file/19570636236.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/62154530558.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8d0abcf3b91357e5dea6017453f67cd4/47119121560.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905164244.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/16528307285.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/nuzufoxamuku.pdfIn PDF document text
    • http://stl-hk.net/userfiles/72254154736.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xatawojonerovizi.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/18690298008.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/ridukufawidadisagadapigi.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/79003910182.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/radudejitijisiwuzolewofig.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/64ae2ef120fa42ad3ebd3b32dc73ac02/78007799152.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zelopivudelafibevuzirari.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68b2898c3---pogaxexetej.pdfIn PDF document text
    • http://vhktn.at/images/content/files/83792425429.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 24956 bytes
SHA-256: 56e60ba6d5f37e3cf8c859883bf92083f8786429c18f2e8462d36ceb0c4814f4
font_01_sfnt_off00014b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B16 10604 bytes
SHA-256: df6cadba800a46d3b402648106439fcf02d53bde53995a3f62bf19b10ddfe1da
font_02_sfnt_off00016350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16350 16300 bytes
SHA-256: 1e611ebb7e8f15bb82fb075771a68760b0d31941c775052c16c6ad5590192c66
font_03_sfnt_off00017993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000191a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191A0 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

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