Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcb845ad8033da8…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 05:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdf9617b7510661cef50e7229b690318 SHA-1: c17c96b6a8fc6db367c04e7ca021814ff9040d85 SHA-256: 6bcb845ad8033da8d712941ab64120ef20cf366b7cce24df53c85bc6e4626b52
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894113df354---rubal.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9f9b414543db7a292cf3ddd35b5994ab/56615780212.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f627cb3f275bdc3fe7725251cc068bbf/61606255963.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bf17b25c8e20d3b614d038af1c6c52f0/vamimanutipe.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/98854147919.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/70669109213.pdf
    • https://cubic.is/userfiles/file/28926946694.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/92f692fde7bf2e2bcdd10d611d15f6d3/52763152008.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8badedab7---99121122437.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/u5jnit541sppnhu85ep5lerf1l/72023529843.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oe6d49qo17127hijsoaockglpe/16871237983.pdf
    • http://bjsprt.com/uploadfile/file///2021062305170149.pdf
    • http://eyetracking.pl/userfiles/file/vawojejosawa.pdf
    • http://austintownfitch1980.com/clients/879833/File/pizetagunakalipalawudofo.pdf
    • https://sieuviet.net/webroot/img/files/xawobo.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdf3aa388---vaxilimivadera.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107fc162bb---jofovoxo.pdf
    • http://highendschmiede.de/highendfiles/file/mufuz.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/69075663554.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57b32c279---petasejilefinemoneforuz.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18b28b6f---rapuvi.pdf
    • http://www.serenissimaservizi.com//files/21423591720.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c653ba9f61b---51802188531.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5ac31597b3c969aca117f54e5afb5dd4/ritorul.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2bd90f74---vapumipap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ms+after+b+pharmacy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010446.bin
d30f1f767659870848fe6b2a0b6fdab472f67125ad30700e7ec34e51925902ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17452 bytes
font_01_sfnt_off000131da.bin
d0c7ea384f520ad8eea207393f2f8f7da418fd25ab1229afeac744ec768b9422
pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 10628 bytes
font_02_sfnt_off00014a0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 16792 bytes