Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63464d583eb0623…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 16:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b67cf5be758cc86450fb7a9fe8c2865 SHA-1: bcbbd9a5238000ef5c0fd128c9e74cc2273a305f SHA-256: a63464d583eb0623376af1fb35addb261f92f049de3591228c4c84ca623d5a4c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a0ad437e78f0b07164b579fac59026c6/46014084146.pdf In PDF document text
    • https://capecoralliving.com/media/file/zimivekizegutiforubusulu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96abe8d751---80875582744.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061905025521.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/sejafexuvofil.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a9b9aae924298aa20fd86bc7ee29057c/judigajogu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a072dac306e---lumizubumojisujiwim.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7a467941e---61867578880.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/logikokurafezurub.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/52236235242.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/rcq0mq1hbsvdnh4dm16708chsd/bokudepafaxafadedavozirit.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a08081c9c2ee1d68cfc53af2a03539ed/pomirarevawab.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfd653e24---70584286095.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/geluda.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/98989505466.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tibunoba.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/56hrmldib5guv811folecevrip/nuwagunodepu.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/tawuzegademovatuzosogura.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e55d3371cc4---19850328406.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bogevijuninexiwojatugete.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/43346255335.pdfIn PDF document text
    • http://sb-78.ru/files/file/revonumaridivelozevenid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hamilton+beach+breakfast+sandwich+maker+with+timer+instructionsPDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 11148 bytes
SHA-256: ba760cec330b09455c09c276481b41ef17831c1c5be4a1b3cd366bd68c6da001
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 17060 bytes
SHA-256: 80f16e3bc88c5628c0982880e10cce6526eb11243fedc8d80f1911b11c71f7ad

Open this report in the interactive analyzer, or submit your own file for analysis.