Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d70387f08a32869…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 23:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 522cb5efd23bd2b8ac74d3975c49cf78 SHA-1: 06f86056b4b3452a2d7297b2df75207298538045 SHA-256: 7d70387f08a32869315833fdef620a408d427426fb26df9a276eabeb9551930a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The primary attack pattern observed is the use of a link farm within a PDF document, which is often delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ksnjl.com/userfiles/files/1975098776.pdf In PDF document text
    • http://benevolo.it/userfiles/files/40606375706.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/jakejexoziwukudonopir.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e027ebe86---39418630753.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109131718278365.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/80089401881.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee892261a---11101785308.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0760c1bdb0484dbbd2adc049202d6b87/72382428668.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/70070530971.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/99387736127.pdfIn PDF document text
    • https://priscar.com/documents/files/sowezujuvi.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lofosor.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xoxamelolanexamarepimumin.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9ef626c613ba274a1117065ad4865454/gavunaremukokigepe.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/87851784ecca7c5791847ab721c9922f/5100777640.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/metijog.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rajowovulobog.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/rekopepuguxixixe.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kivivujewatadi.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/liwawo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6df15f81d44175c90fee8929a3b2c56c/bomikejo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vojavafapovavon.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109110748281243.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/sivosagopazel.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/95553988534.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pifepanaxuzojuseri.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/galowatomuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=edit+chrome+flagsPDF 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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 10800 bytes
SHA-256: 1e7b426eb719f2c707558108590c206d0ad556268fa26522a1388f8c10ac674b
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 17856 bytes
SHA-256: 5e8ed10d192c3eeb7cc2c9d462d806abc1a7f91517f5b10c7296fc818fa4e260
font_02_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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