Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa82efb6afa1322…

MALICIOUS

PDF

80.2 KB Created: 2021-10-10 00:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 504bfe84fb92ecfe785897d3e3f65588 SHA-1: 871df7d3f97f0906acd03ac4a599bb52e0d043d1 SHA-256: 1fa82efb6afa1322de25a28f6f1e4dcd168385efc0a981a4c1c346126299c140
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF structure and numerous external links strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://crysiq.ru/uplcv?utm_term=iq+test+questions+and+answers+free+download+pdf PDF link annotation
    • http://joy05.com/_UploadFile/Images/file/jojug.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/mumazoju.pdfIn PDF document text
    • https://nada70.org/userfiles/file/25749128643.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/fukujubegikejuk.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/xikolemu.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rejepasuburaxebuzagel.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/xexeda.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51d4713dd---nuzojawozaximipabo.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/gitokuduburonimezevirera.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210923_D46A9A3D866C673C.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210919042915.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f850a91d60---kipupip.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/vedikof.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e8f837574800eec3ba216d6d130f836b/92690271121.pdfIn PDF document text
    • https://mihalex.by/files/files/pupolo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/36587530642.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/54401528050.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22676534876.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/25025661186.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/34363796497.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/79131628544.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/2628995746.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af2e2e0e5---49042074289.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/bamamidudetopale.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nojipulesoded.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/nadejotelopurabibiga.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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 18600 bytes
SHA-256: 825707b04579a5fa1d523500665229646cd91cd48587ea1258756535eded2faf
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 10776 bytes
SHA-256: 872165789d1995512bfb5a8e29f7b10992392df59b86bc37d32804cff36ec520

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