Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8da739c25ca3674…

MALICIOUS

PDF

170.6 KB Created: 2021-07-25 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9615a705bc55eba710282f1e35ecd8b2 SHA-1: 734318e6ce44ced7e09e7bbd28690e852677a12c SHA-256: a8da739c25ca3674bcf30acd6c3d7d936d4e8a0a550b228bf89b283b74e0e1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8184

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0c51250a---sagelajazanazifaxatuwasu.pdf In PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/82575644281.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835cd64484d---dotegamonexurosotuwifimov.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/savoraladulamodam.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3ff708cd2e51e4835cf32948bea41d4e/bejurus.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a2735003---27378833552.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/29779837602.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4612ca42---30465679091.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089537f8a9b1---pojutaxoralopaz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa61203433---xakij.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1824ac62---fopabapurog.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/97057992104.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe47a0a6a0---35343709731.pdfIn PDF document text
    • https://europartner2.pl/uploads/wusitasebavori.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/kodulelujevijobubo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e2c770b---volokugugowelebesodib.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/17189117296.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160782d006053f---24768996914.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a2643c47---levomixinasati.pdfIn PDF document text
    • http://redactron.com/userfiles/file/3756920286.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/28412134425.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70845755fd---7545615693.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/66343597648.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a1b84686---vutokikileruwosumopok.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/93572730752.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/46673936333.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd10701c4---pavujelu.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/bomesap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=char+broil+performance+5+burner+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2031B 28900 bytes
SHA-256: 9fbce67679727b4ccc25db1044fed4d2d752a63d68f3b33584194d8f008a9680
font_01_sfnt_off0002444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2444F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C60 18000 bytes
SHA-256: be52b54d91da7ed3234b19110de252b8921e62622ef61f6da973fa43561a27b7
font_03_sfnt_off000278ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278AD 10884 bytes
SHA-256: e17066c4adbf30e58777c902618cc96123404a45f7e6d74baba772891a621f3e
font_04_sfnt_off00029165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29165 1800 bytes
SHA-256: cb2d23ba59d6fab898ac4861c5a4e22643c1fe5c039578fe3c63b16aaee6607f

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