Malicious PDF — malware analysis report

Static analysis result for SHA-256 4486f2d3dbcfd0b2…

MALICIOUS

PDF

92.3 KB Created: 2021-07-13 16:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80cd5053a69c06cc975ec243166cc81c SHA-1: 08c3aec8b813cc183c86d7bfb3f169bd9a019aab SHA-256: 4486f2d3dbcfd0b2789d965e14a15a57967adfa7d5abd69d4106570c00de2d67
204 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious PDFs. The document also exhibits characteristics of a password-protected archive lure and a fake download button, suggesting an attempt to trick users into downloading further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=gta+sa+obb+download+highly+compressed PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/77b242578e2a92e72c76501ecf1a8344/89281088192.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf51da8d---24169759030.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/gusofudovowedabagudumuva.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7a8ff2a66a390fa1a9042ac289b54a78/23883930979.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0795127a2---bomafevisegobop.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077648672b5c---45339618860.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kuvusowovewavumipawadim.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34d4cedb---xegoxe.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/xepagenekorikiku.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/89918767652.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0gfcclcjastr65keqg301kfm3/81987723080.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/31380565673.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91dc4fc7c---3313215846.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ff40a874---jewel.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3corajcesci05t98ef84uqsejb/74623102036.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ral4j60vhuipa1q4je3788qi7b/fudajosilamukofutuwidotas.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/630d021d1ad4d8a0e5f3f2ac25e2aa5f/70078138833.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/129b36c48d0e80e39d1d510f100af6c9/koxakevovadasedinejugo.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/zufipixi.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/32449692443.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xubinovegurogiz.pdfIn PDF document text
    • https://ancoraeducacion.com/images/lofuk.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zovelij.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_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 11340 bytes
SHA-256: cd450fd216e23ae68f94c2068750fa45b5382d2d3caccf5dcb8898729f5b58a3
font_02_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 18112 bytes
SHA-256: da23c876b329896b96fd33abab42d3d399fa531482b195f9ecac4fb61ffed611

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