Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16153fce182ed48…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 12:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0871f6076af0b38ae97c979b20e9583c SHA-1: 6ba555f2295da9feb8a3b99bae1207a6a08472bc SHA-256: d16153fce182ed48a6a0a313625ddb9d00e1d106c06a71c38bcb264bab32a36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://nomylo.ru/uplcv?utm_term=bully+game+download+for+android+mobile PDF link annotation
    • https://teamcode.net/upload/files/31346696265.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/be439e96be90e98c1cac1f73294b19f5/57295826602.pdfIn PDF document text
    • https://kawanmto.org/contents/files/dukesevasatenoginuserek.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/pumibe.pdfIn PDF document text
    • http://chamdure.com/DATA/files/dowarejuzajumiz.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • http://dakov.hu/_user/file/lumuzaxunef.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/kekinebaxuli.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/2329788572.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/fuxivamo.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/rimogid.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/luvumanutenale.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/feret.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/gogewaxujijaxixoxuv.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109191303167171.pdfIn PDF document text
    • https://redac.ch/upload/kofarumumaduvojo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/75966486225.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9e40f0eabfbbb132c93497e45cd4b77a/71042117603.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210929_3BFAF11CE796E987.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/89424794162.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/tedurexozuxazatumekovit.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/30146941101.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c020ad2c3---pezijikonop.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/87942296412.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/jikovegivu.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/duvuvuxuvaxupofipasu.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_off0000b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 10924 bytes
SHA-256: 2cbd55222b56c3f7c2ac69fc0638109b5e8d686a468741e178b02aecdb3c0e75
font_01_sfnt_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 16660 bytes
SHA-256: cd2709c9a0bf2cee3f9f49edfe387572822c3ec28bdc8399c6a5b6c4e6a0572d
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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