Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a38757f3aca3761…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 14:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1277df3d6c99ea9bf304b24f5ae3e4c0 SHA-1: c1819633aba872f2e8b3cf12a78f33bf0d88b99d SHA-256: 2a38757f3aca3761817d75d87728391da6bdc861a15e3d3de4908191473ea7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and other disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or redirection attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://szakkepzosiklos.hu/upload/file/33597470801.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5630723ca8ded79b23dc1c213ef97cbf/fogafori.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c303321c38a---gedufelugajis.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/33474437625.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/df0a90baa4c66f294d69e1f03703269b/dusuvejakuvixedelara.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac11dc8af74---37456276348.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ef9337440651c40f54950675a43b7e64/dujizone.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/td2ujab1dmak3lddnl5u0cfesk/rawaparamefujefovimunore.pdf
    • http://ciaooo.ru/uploades/userfiles/file/9844465873.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/sukazitatu.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/0cf4d6485573da67d4ab6885e1eda7aa/30857680409.pdf
    • http://industrialdevices.in/uploads/86282997754.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090582a3a3bb---wugupojobeburapi.pdf
    • http://xboxheerlen.nl/userfiles/file/78587418616.pdf
    • http://seoulsquare.com/userfiles/file/90236469802.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665cba2e2e---kisatenumub.pdf
    • http://sillajen.com/fckeditor/_upload/file/94118868289.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/683e29d1c9e223c17f43d71d2c6f7199/vofoxawavowixarifema.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/4464e25b5ed10c0f524f966f7005c8dc/jetananifibopegotu.pdf
    • http://nanumed.ro/uploads/files/86446830887.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8otavkf6rmgdff1mvshcn4821a/39138950923.pdf
    • http://yjsyrj.com/userfiles/file/38422285979.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/pkbss0qlj6b6a5u7ei2mdgaulm/xodomosipajitapijokuvuvo.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/bitesa.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ae8f2cd35d5c3161a762df402a3f9c85/20262859063.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6h09dgrpj893jeodd0o3p30q3q/gekowamopadolufogadetuba.pdf
    • http://clingac.com/d/files/30970613065.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=realidades+2+capitulo+1a+7+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed6.bin
0633c9be4d0a843ce989e979bcce0d1628c72489aac6e9e8f14c7dd065acb9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 19976 bytes
font_01_sfnt_off00013383.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 16792 bytes
font_02_sfnt_off00014b9a.bin
bd15458061d5b8ec9eafb85b3f4b7999d1f7eadeb4f8f13fc4f110c5bd870aad
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9A 10960 bytes