Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c2232e8769d95f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 01:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6007eafb2e0a9959242909ce6ee0988 SHA-1: d9640dbd8834f408409c79315cd12c3e2fc9e1cd SHA-256: 84c2232e8769d95f9df29f0568f3e37c373e8ba685b56dca383bd6cad882ece4
164 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 functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the PDF is designed to drive traffic to these potentially malicious sites. While no scripts were explicitly extracted, the nature of the links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=class+6+a+different+kind+of+school+question+answer PDF link annotation
    • http://aven.su/userfiles/file/jirisenituvomaf.pdfIn PDF document text
    • https://mashura.co/userfiles/files/39685397034.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/35831904230.pdfIn PDF document text
    • http://esejsc.com/upload/files/ponarotagilipa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c6e759cc---lideboferitojote.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/53449727070.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/33737478601.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/tunepewo.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/412865183.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d5da4f807677a050fa225187a6a7b38c/pewupivukavuz.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/68780185456.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/58756692118.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e458df6b---texasesikizefo.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/79236184285.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/gekasivosenuvube.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48b3c0ea8f---62327720376.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1f86407ab092e75729bc8fa87b292a1e/rulolixele.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/setinupa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f2d3aa8f3121907c4c1502424fb4740b/22763605003.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wokunakalupug.pdfIn PDF document text
    • https://anfauglir.com/images/file/19407033696.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/navajedaxuwojuv.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/98042785212.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/2953097424.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/sivubidomoxijoda.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_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 11196 bytes
SHA-256: 7c68e2841e72eccfe046b15b4acc50c15f363d57ceed5f421434094972518cdc
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 17872 bytes
SHA-256: d605d38cc4cebc91419a399523c061d4ac7ee67b57cada91e91288d3f7c3be91

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