Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccda02e9d2b2639…

MALICIOUS

PDF

106.2 KB Created: 2021-07-05 07:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1d7da9616c5f85feb77ba0e9f3fe4db SHA-1: e40cf57ddb1351f080ed7cbc6bf6fe4ce0cc5792 SHA-256: 1ccda02e9d2b2639deadad9f85d7519ce4303b9286c656a67e5dbb9ad608931d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicative of phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://irlanc.ru/uplcv?utm_term=female+singers+of+the+50s+and+60s PDF link annotation
    • https://area5srl.it/file/79465399792.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0q4j7s8d64mb279pe5s0i6j7vj/84035289125.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/30462915713.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/acbcfuseg67g2sq64hfavlgl50/dejesibanijo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kowavoxut.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/17711154150.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tifj8bhimffehhsn4rqmvtv514/31112152868.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/buvifofemivad.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/95de03e4fe4244efccde43153a3a35e3/90644493126.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce297bca56---muwosi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4550b4bd---jewadabigerezanaxa.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/83441193078.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/96894570598.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f296eb79115ed450183e9f4f2ac6a115/14365389311.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f8dac46e1ec5a6ae9e367111d7d7369/dipebatamukose.pdfIn PDF document text
    • http://greenbrier101.com/userimages/mizoguxiwoze.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b64b85099---bapabekufodipek.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7210d92c68---felikojize.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ibri7lrc4hrf7safn4ldvt3bg1/xudolidujemupo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68646195532.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/83452478473.pdfIn PDF document text
    • http://rld-carbon.ru/file/xepimiwotefele.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2926faf4---mibasakineteno.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/64720416651.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/38877292009.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210607_030330_8593.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_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001521d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521D 17796 bytes
SHA-256: bd78837a1f80ab292135cea35e77a34013018b4c5d40a9f4fa1ee376c55aa2ea
font_02_sfnt_off00017fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCD 11204 bytes
SHA-256: 8c05072cb8079e70c4f68f2827fa39d4196668c5608b4415be409c69e58bca0a

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