Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2a2452255868d1…

MALICIOUS

PDF

85.3 KB Created: 2021-08-10 04:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 288a6853baf654201e80c538ab363256 SHA-1: 94c63ee8106632a01dbea17efd0243e360ebe684 SHA-256: dd2a2452255868d1329a6138f970f8b11d942d2f45fd3f2e8bce1bc2ecbacd1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and content align with a malicious PDF designed to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=how+to+replace+heating+element+in+kenmore+dryer+110 PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3863de98db---55879295457.pdfIn PDF document text
    • http://soles2walk.cz/data/file/14417689292.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/rerala.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a6938034---59388383491.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/jerajegagufitas.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/17/file/zaratudogowidifunotep.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/vobowa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447cfc0742---kuzuliwefo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4kk6731mjvog5hmt7qkcitbd89/vakotisazawetobujok.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078aad5b4087---rafavede.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gakikimu.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/97767911090.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/rewoxujitenus.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f5a6df8e---rinazomajuf.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5bf77cb14b0ceb73602cdeb85b50bd20/98156982948.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/gisaregofape.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210705111113.pdfIn PDF document text
    • http://mobiliteit.nu/files/mubulupo.pdfIn PDF document text
    • https://premium-house.uz/images/file/18348404885.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/50f1488867baaa59f6e61a96dc220cd6/11180192699.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/fibawimenimubit.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/86377440759.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 16588 bytes
SHA-256: 45e26724d4b7fd88c798a4a42982a5f70599961a6b28c7af5365f92062eabc8a
font_01_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 11252 bytes
SHA-256: 1bf067e913b925c2ed169ae337d3899c7462b16e93f69463b0f3c563b8b4a713
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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