Malicious PDF — malware analysis report

Static analysis result for SHA-256 b350cd940dc11c3f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 10:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86aa4df9651184e6d55017e37644d75b SHA-1: 42baa3e2c3240a0989e532475243384884eb2be2 SHA-256: b350cd940dc11c3f3ed301c8caf92e2076a98dabcf284a71c6f9a8a331ef667e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=letter+review+worksheets PDF link annotation
    • http://timebank.ru/sites/default/files/photos/pagefile/ledukilenavuguxilox.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fifedo.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s1vl0k71idd51hjklnk5hqghpu/6090515194.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7d62c270---velinovezudurebaniwi.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/gapafumiratejugidel.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4b8b8197---jezodute.pdfIn PDF document text
    • https://andrejc.si/files/file/sabimagalamezumisejozolex.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872b5d4eb34---80268262784.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kofawikiro.pdfIn PDF document text
    • http://acril.ru/ufiles/files/22606680738.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kunasenazile.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/cd6066bc38dd3e08a13ce9a4c56d77a8/51462001805.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/91516569764.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d941cd5459---74734638374.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0b78ab125b382395966db02c9101351c/teneteda.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/dcd80b8d843f6ca08a3f0c3775334344/69150590538.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/79f25071a0780072bbd15f3c5ec3fdd9/wuligunimufazatuzosaxoxux.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/us8d33fp5bs1e41ng80fdjhhm5/rufobode.pdfIn PDF document text
    • http://carszana.com/image/upload/File/63576684741.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/34606125373.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9e2e04c5253f3acf5f7bcc2f76bdba2b/51853347070.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/13644478445.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/juximutufejo.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/31634358473.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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17584 bytes
SHA-256: 752cb50a33bceaf8e20f8cfd366d1ac4408dd3a1a20e9aa74279375c25a5259b
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 10092 bytes
SHA-256: c0e5e483e9d0c4f2fa9854f6edb5cb5d3ffe0f83e1fd98738f268b55aa4e5ce3
font_02_sfnt_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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