Malicious PDF — malware analysis report

Static analysis result for SHA-256 416486aad636d4e1…

MALICIOUS

PDF

77.3 KB Created: 2021-08-11 20:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8ae1930f6ffe170a4ed5df63e74f4cff SHA-1: 8b7f3ac3407e96facb592e09efe2177248a53f2f SHA-256: 416486aad636d4e10fb553313d44f8c20aa796b9757e407e03c9f41152918ec1
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://medvor.ru/uplcv?utm_term=ejercicios+resueltos+matematicas+2+bachillerato+sm+ciencias+sociales PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e534d1934cd---6607252359.pdfIn PDF document text
    • https://gangnampools.com/contents//files/60610585120.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a09a56426c86ac34ff1419bf2eb2b2e2/fobipededisu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607304b17a884---zanodexifejavarudolem.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/wulujazirubonolovaso.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sajowapuko.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/dubede.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/tenowigunurijixifupam.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210723_E6708E8A59DA851E.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/8elb0ef7ebakmvgn31c02lsdir/neluzigoxifon.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/13768189912.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16aadcff3---24408160779.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e5j3ltmifd99921t5shakq52po/33807316292.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dd7f1a71---31136368767.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c35b69cd0a41c8df3dd9dd6ccded6dd6/95929046173.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af18673c1---teronufaridimerafa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2da64fdc---nasopuwirowuzixibu.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zupegaririg.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/54961470151.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/27852914470.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/ruzejalupepalebikasefowok.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16093531141283---83723228286.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 17488 bytes
SHA-256: 33798c3a6a8fd3b10d92e446bdb2306641df236008188a653b6e3cd455a81985
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10968 bytes
SHA-256: fd94cc587cff76e76c8ebfea0f3bb0b09960fa129c49086e1e78fa322259b229
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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