Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e199be6a031411…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 19:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f959eef59ac0791ac139d07913a6f33 SHA-1: 1d2e64d58479a1e568d1323dd5453e290f8fc3d2 SHA-256: a2e199be6a0314119d0f6c2427bbd7ff499ac4db4708665c99ec623ae0b527df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=android+health+app+steps PDF link annotation
    • http://iseveranscopy.com/upload/editor/file/wupuvi.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/pinunulebalumafeta.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/rovazonofimomepovikiwasuv.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/1207353318.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zexojid.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614973ffe4eda---baxew.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b85e40fffa---3701626661.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210914104455107.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/vofituxuwovujekutozuwovod.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8c59bd98f8346edf04d3fcac544c4764/fasotufilakunix.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n2ktcphtv2gip670pu1bmiqvii/borofowetegetudu.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/gedijepe.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zitefujete.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109250747157437886eccjo7y1pmv.pdfIn PDF document text
    • http://kftchem.com/upload/files/selesenorijera.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/fowova.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05507807e---49461307103.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/59b422fe669366d692eca81e855515f4/ginuzuwibevutinifi.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/lujelabuxupaxopisuzogev.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/22765766034.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zuzegovomixudebexowupu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c24aafda---71149191770.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/26471157684.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bcdbea43c3567100479b609efc4491b6/94931277847.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613864fcafed7---16839019173.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 10468 bytes
SHA-256: 7312252805944fd96f385c9bd6f904a5d0f31bececf0065844f8e1699669f813
font_01_sfnt_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 18732 bytes
SHA-256: 2917c128897f0b4c75bca2b2f31e33806ea74078745b64e8a4f22bb2eb9c1a66
font_02_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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