Malicious PDF — malware analysis report

Static analysis result for SHA-256 8437e70776ac0efc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 07:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c772616b385c8fb7d22137075334b947 SHA-1: 0f8757d83a85bfc7ace49cd751183182001712e8 SHA-256: 8437e70776ac0efc9a0bfe13829dc7f40e16a68fca4c4668970898a1e5bd6f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://justsayhi365.com/uploads/file/wofejumoje.pdf In PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lasedetel.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/dojadu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb45c5de---ferusibekixatasot.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/21242326796.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/20091170681.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fqcvs8b8kgm789r1bkn8c26kpp/531120296.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109110547355196.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/42017334713.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/79936791927.pdfIn PDF document text
    • https://termofriz.rs/files/51297209441.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e94d1c7324899e9bca42f378df9ba6fc/gexob.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161400ab26b45e---60046982281.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/daxuzumapufoxumubeb.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/watoxusebiz.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/15655682604.pdfIn PDF document text
    • http://cartopack.be/Images/file/44590235980.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/sapapovuraxe.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/46877544097.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/gapefuzizosivexabapan.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/71132256257.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/22371616243.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/86793530570.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/jusegatifomopujezekarolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=messenger+app+on+my+phonePDF 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_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 10572 bytes
SHA-256: a8632ae6ebabefd4d9fdcbbde07a5d44a9dee4b46540db95772cbf682f2eb0c3
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17928 bytes
SHA-256: 969cff64568a3d1d7a0feb3095d5762a23e01baeba7d58a0244bade88dde4227
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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