Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a0e8035345fa2b…

MALICIOUS

PDF

68.3 KB Created: 2021-08-13 19:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e17d36bfbd73ca883ec85a70d3eaa71 SHA-1: 4e347d0e7320d056af4e443e5c8a1284b2dd1f0b SHA-256: 86a0e8035345fa2b357b0f76b9ca076478547fafab52801673770e8956b4bad8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents a screenshot to trick users into clicking one of the embedded links, which could lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=how+to+make+a+simple+homemade+go+kart PDF link annotation
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16093398f52764---lexupevojeriwilinikudum.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/99731012994.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/60727923186.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161142c0a1e28b---67485671247.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/10d0bdd29c16fa2fdc3e6cdffd38541e/bakivoxefawe.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad757cd59---88944065631.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/lafisebezefuz.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ec8c95bfdce6870dad1f6e182d03d73d/wikupigixavubufosuv.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/80682816462.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/51308849823.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/39242250504.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/33355394945.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a67c1ef82---7410843366.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/48872993589.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/42581074253.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc49d49f214---28243522932.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/be1mjvpcrjcs7vdi999p0fit3c/60804827643.pdfIn PDF document text
    • https://wita.lt/images/files/95215626697.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mp20o9lll4n2rl82li2b4bpkrn/19018076049.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/benovibumozobexabuvexi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d9c983da851788bc270efdfc475f48d0/21642356278.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 10904 bytes
SHA-256: 26b202259db7bcb83aebc91e59f70fd6c65780ba03698a9187116b6d21db2287
font_02_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 13132 bytes
SHA-256: ddfc9bf03a7c7d18702cad21887fa83ef2d2dae429449307c7b0dd61053f6e15

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