Malicious PDF — malware analysis report

Static analysis result for SHA-256 859345231f90a02f…

MALICIOUS

PDF

77.7 KB Created: 2021-07-24 05:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0309197924214d513e40715aff10e60 SHA-1: 39b38fea96b4ac07e110000b2269c76d8804d94b SHA-256: 859345231f90a02f2a583d357f3da4f3b01fd077eabe10d0b05b0d7521e8a375
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many of which host further PDF files. This pattern is commonly used to obscure malicious destinations and distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a25cfe08c99af3229aad29081d564612/rutodinofexiwagevekejur.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/vovakadizewubuzalekuf.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38a16f196---41813557054.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/521600f880d4c06177c91dff15d5ff70/16978978990.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dg583uupevenrvgf8r12bdi6j2/35520730901.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/pamafajilamisiw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b4088be0---19426287720.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/weditivikowalurezuxo.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/95663900737.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075463b9b71e---59496906669.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/0543a792e75324b99051e46c18bc462b/sebirezovub.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160707e50ebabd---topupigonizosaf.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27288c503---xutegujage.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/38517095458.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd2a41770---tiwinukebolojupe.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tamodoza.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/30717535693.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/88013209647.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4482951e59---52478222155.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa59a4eea---91471384532.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608714eb74273---munaborasexifexubodimano.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/56581240609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=star+stable+star+rider+hack+2019PDF 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_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 11012 bytes
SHA-256: fea70060a15595bd9965a5b37740c7beb9dbbf6694e6004d0d238e28b82ab245
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 15848 bytes
SHA-256: 0d6e9622090174f1af1d07556d5aea5b01dbb6a741f536af267d9d2564e4c1c9
font_02_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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