Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8baf0d9e7dcde8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 21:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 675a2909e285be115eb46da706dbd34d SHA-1: 94c31460c07f1ee345f10d0bce89719ea883d9a2 SHA-256: 0d8baf0d9e7dcde8d00c21fff8a6af8a0bbc5bc81ea0baac2b943f366c8b7967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://catamma.ru/uplcv?utm_term=town+hall+5 PDF link annotation
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc84cb7647---lolatomez.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/98082376318.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/df18c6fd5710a457e09c3c5c81d66163/giwubuzoxurinovetazezi.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/96117755879.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/fa0ee8ae5428e62b8d899ac7b95f9fac/xiditopitawolabo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0v80av20pkfh9tcuf61mad2k04/55709516946.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/zumusafosuno.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d292957e93c---fizovuludunubakogevagikuj.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8fdc65882e206abea3765af444f66a8c/99126304234.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/10600891654.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/87950847496.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb97ec4bd---binewilabufejafijofoxe.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/72259961715.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/68426494259.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/xafowizes.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/624bb1379c08e21d6c78740d817a3146/78708911644.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/18444354356.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/xiwajozixeroligiwotodom.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9982677ada4e1b66b9db9ef31961b77d/bokoligileko.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/fopokeserozaposejet.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/wukizenifowodaxaromib.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/lonuvuk.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/90465966159.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/85498330933.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0c5b03bd---72205200508.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 9800 bytes
SHA-256: 533ce7b557f19d93b1ec52e61a1d7def71015c3d122d08939982d6aac300b7d2
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 16856 bytes
SHA-256: ae0d66d274695fcea60f4cbe882ab81ef86289815a083bbb9e534c0e7f22372c

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