Malicious PDF — malware analysis report

Static analysis result for SHA-256 2539202dd08d4620…

MALICIOUS

PDF

128.1 KB Created: 2021-06-18 19:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0e98d98c9d90f9fbfd5b4c7423100f1e SHA-1: 1b24869082741437711a1ae03ec9fe80046f69dd SHA-256: 2539202dd08d4620be0d1af729339a0a306c7ce6f3a34b18b79432b095210ada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b65bfb8b012---59378960966.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797ee6018cf---51614691504.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77d68d073---tufogo.pdfIn PDF document text
    • https://t2sc.me/userfiles/4943787392.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a847c992bc4---46342963721.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/846d55ec657c651faa41884043a7d8ba/60252909426.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085448b7f042---64120016368.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78d24532---70023769424.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b16f3a16aed60e5e0c9d975bd6d8fb96/kenepizilopevimu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c2b8ef2f0d34a4f4c3dfb18e83688789/fijapebud.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021052504095545.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f669b21ff---jetitu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9e5b192b0006c0ab8ca6df851ccb6a43/napijoburusevafenetupopiv.pdfIn PDF document text
    • https://castel.ro/userfiles/file/siwokasikositojejama.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/82736506540.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/bamex.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=purusha+suktam+lyrics+in+malayalamPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001b582.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B582 19328 bytes
SHA-256: ec6f114d7d59d3caa919ebae93d4e4b57e48b4966cbdd1ecce949c4872198018
font_00_sfnt_off00013c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 5204 bytes
SHA-256: fcbdc85a70d2403fd4b7874b8f3d005fff8ddb28b50e2881d9515839cd085535
font_01_sfnt_off00014e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E20 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off000159c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 9268 bytes
SHA-256: 7168bbddbb7b216fb8b921f8b9d8ee14df0b4f66a61af0fce6e253ecbff62cec
font_03_sfnt_off000175a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A2 14248 bytes
SHA-256: cfeff411c668b71e638e001cafdf19203831d6dbce33f622c53cfa370598394d
font_04_sfnt_off0001a0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AD 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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