Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c31b83edb3601a6…

MALICIOUS

PDF

80.0 KB Created: 2021-07-01 11:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f9dfb40e0af920b3637fdbf4e910e83 SHA-1: 8c9a54716b095ad7ba7ad97b67e136c0ca5b9d4f SHA-256: 5c31b83edb3601a66ced9ac5e937b92570f7160333f40a19d312c3f68a08ad59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=change+the+following+sentences+from+singular+to+plural PDF link annotation
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49744d203---vidifofusovuwijifufitewa.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/momexupi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4fab06a13---26646998891.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sanafukafesuwelenoj.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/35612508255.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/11432924463.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/88684984231.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e4220a0f7b4f6261548dc6fd40dfe1c/75994384431.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/mapogituzevinijumitu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0ddfeb675322d1fb9a75d764bef9695e/64481812124.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fupufekoluxoxebotowakagu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3bea242c---93927062096.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/balale.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210626053215.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wejikepexajujezanem.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5bf9c70bc223fe3fda69ee9cfd964670/79240046359.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/puwufosuda.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/690cbb906447eb38e80e5d08cd2f03e6/bebepikiwufatoruwuno.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/60378faedd296747b02a08b01e4195cc/larelorabobat.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/sidajesisogedosab.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/69lq7pdg8s1k5erp3k9bg46nq2/16595306682.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce289583891---36972388702.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/827a772baa25469927226d4216f80cc5/zabipuroxi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0c154df98---43004184560.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 11144 bytes
SHA-256: ec7f2e8020d29576fd653dffdc17f3fdc7f6c8141ec462e8d02a97c9355b76f9
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 20276 bytes
SHA-256: 052e4ffc984c9cb172d784449bdc4ae8e2e6ee60e61dfb772e0ce1bf75f60d6f
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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