Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de5d4e2f3f4986…

MALICIOUS

PDF

85.1 KB Created: 2021-08-25 22:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 122634329130e6494c6368819946328e SHA-1: 11b9e8c6c6aa609748abed08c07e437e9034fcc5 SHA-256: 86de5d4e2f3f4986a38e7d005b635d6e42b893b9895a082c251d7caebb642cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cructi.ru/uplcv?utm_term=iphone+auto+reply+email PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d462927a630---nulexe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a321e1b803d---norosipemepira.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d18d03dfae2158aec24ceb8cbc201734/19527970004.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/99619646735.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/u06ogg9uk87g9es7h7bprhe964/34736796996.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/givilibu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/be156d70744e967d2af847f390b90c79/juvalilevurixepusasuk.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624820688.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985b6f0f153---19156226202.pdfIn PDF document text
    • http://email-database.info/userfiles/file/jovewobowelibimux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073446a63923---ruvijuxemokubepoj.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/90505725973.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/tajelenuramufapaluwupe.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/57020167081.pdfIn PDF document text
    • http://myqself.com/upload/files/fiwexeti.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113dc1e7b282---22032997906.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/xenowazonujorol.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/tewevirovizijof.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2e192186---newisesotajoperejefa.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/ganek.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9579278ad8---voxubowapunulaka.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c513b027---xidovuke.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/18ckj4c0cdqoqsldo61ndku15n/bojafigumuvudon.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/nubadexejivokunawuk.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e263f2ce0---lifemibejexabuvekaki.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-8-10/20210810062906227708.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/30264341951.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_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10516 bytes
SHA-256: 4ff6b0a6d41903264a14bffdb5bdbc0f40170ebbbffda25ceb63c68a73c78be2
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16828 bytes
SHA-256: 563dd6a637bd7ec3f3af2e0cac43927ae7f7bfbda02cef95ca01207ca9c18acd
font_02_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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