Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afbfc11046dfb53…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 01:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4debe5257086b5eda57de7054449579 SHA-1: bfb475c737089cac107de055837b2d6e402c3ec1 SHA-256: 6afbfc11046dfb53622e8a11d07308273c98274228dc4dcb0e10de4910cf003b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains a malicious payload. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to the download and execution of further malicious content, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede6dfcec1c---41279679684.pdf In PDF document text
    • http://china-hold.com/UploadFile/file/20210515044414753.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/15001756242.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e7cc9439c45ce7b2f36dd7a437ff1a2/74878845339.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/08ae166c200c5b1acfce89fa21f5137c/82549644281.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/56d661e4c82a0c41eeba4f84ff6b1bff/fijotokupino.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/69947512043.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc5807775---lawisakebizib.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607967d7476ae---wabozalozib.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc27121e914cb1a36c90f0df7c6eb2e6/rusizamadakovofexerumigud.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab774ce912---wuwujinitilavite.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c9ac030b9d896e1afc967c594f249f2a/64846150461.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf413e10a63---wanujokokubasawugonore.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/7qvc58b2u80ico5jtd7cl123c5/jitakezujosugorekizava.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ae4324a---ridorawebunege.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wepagaledapebimi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb57d5558fc---19050246753.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3bff82329082d3d874d25b9ba03294ec/zurapipesowiguzemukafizuk.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/88353322443.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/87789032950.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e7a6a6df---66612056781.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210604_EC1EC99DDEB00AFC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=control+system+notes+pdf+for+eeePDF 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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16936 bytes
SHA-256: 842acb7fae83fbc6b5e385b242fae367fb5e3a74b1480b3a16cc3301f84f5b0f
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10548 bytes
SHA-256: 52c8f4a703da038de9ce66426a8b8eb5ab66ebe28df17134e205c2e96c816ef7

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