Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c31190e6ecd79b…

MALICIOUS

PDF

79.4 KB Created: 2021-08-06 00:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b713301036865799bd53cb0b31bb52b2 SHA-1: b2f9236a93e98c2a13b645de7f54f551cc1d09b6 SHA-256: 51c31190e6ecd79b542f1ec7e906344fac4ad5c5473238fe9472c63a8184e337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as Pdf.Phishing.Trojan. The heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160740db5c5bd4---39657809741.pdf In PDF document text
    • http://fotossc.pl/_files/file/bamodeguno.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cec5bfc6b---turivazidedekazulebetewuw.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/gokokuvelubugixedubape.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/48ec992ca2848309110f228c68676de9/4747817153.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nokusodokafuzale.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xemenu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609992f65cfb3---venowimakuvizulizar.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/neresefekubomupibo.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/79737606004.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/kemul.pdfIn PDF document text
    • https://angkalaris.com/contents//files/valon.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/78667716011.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911b78f07ef---venotosidolupupixejim.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/76485279478.pdfIn PDF document text
    • https://blugarden.eu/file/noribotusizawewazewoset.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/17189117296.pdfIn PDF document text
    • http://kasargod.net/uploads/file/40120486575.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed12430c315---tovelekekofuravoxagazorog.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf6d3cd81---80478075963.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jigafekopadukeren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cordless+phone+with+answering+machine+and+caller+id+announcePDF 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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 15940 bytes
SHA-256: 858c862ed49f12cfef8bece26fd5fce01b6f20d99a9c53c0756176d50365a04d
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 11180 bytes
SHA-256: 4a87420ef6a374858a7df9b1e06b96fe7578222f7c7260b6be30bbc49dea065a

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