Malicious PDF — malware analysis report

Static analysis result for SHA-256 d494b0d8af5353db…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 20:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa286994dce9ffa4bf2f84dacc4cec7d SHA-1: 058058261d6a47e73f02cc820d0c7dd034cf0e15 SHA-256: d494b0d8af5353db61a18c593b752596f3d5de428488a080bbc16fea7af746e1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt or access an archive, a common tactic for delivering malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://knx-shop.ru/admin/ckfinder/userfiles/files/tebajumex.pdf In PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/58397692008.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vesuzazi.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/64520137915.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/6114336852.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6d51af35f5d66c4567d7134c97a64f4a/mubegujiridolu.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/80424338177.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/89967731347.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojugozejabovaxagepep.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5c142d352b0d6fa0720c7e90d8c8c6f/54559775748.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f9505f0c---rolewofapalenidon.pdfIn PDF document text
    • https://clickbox.ro/images/file/28349456061.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/28120634025.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pudutix.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/33201aa6ba100e4937705413fb35026e/dezutuliguzavimowuga.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/12653729312.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109060236381999.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/8926953397.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3868ec31836f1d416ed1805df4901b3b/detakeripelegunerepapuzon.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/sinolonukevezusudamim.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/beruve.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xelapevuvubimolifimos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+lock+my+iphone+xrPDF 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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 10736 bytes
SHA-256: 0bda5d43c4f1e2dcfc3bde67deea5f7335081250b1b52b22899bb29f1f147dd2
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 17400 bytes
SHA-256: 5300a38a9746e6bf212e5eeb7d8c8405f7c8a96ea42e1b3d145f63e4d6e82af8

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