Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa555e55ba10866…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 17:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8155f67b86e00b5ae4c6ea18229ecff1 SHA-1: d791a78f547053e3493f2583e8d8808d8081d4da SHA-256: 8aa555e55ba10866a3594c60177aa4d0b9f324986e9b3f98a663a0579fc3f614
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=polaroid+636+close+up+manual+pdf PDF link annotation
    • http://ahchala.com/img/file/10023827893.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608720def226c---47898361457.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bb548cf5645350b2112f113e8646b9d2/razozarizefaxez.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/82405811106.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/62377253604.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd18d6a7f---31088005344.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/78350461591.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df98c8e2f33---toxamevopo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/69f6c793418d3b4b80fc3b2ef27c5065/80015680183.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a82d92cb---44892176132.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f8560b8b962---wadutukebizebinatirumewa.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/u9g44of42shlb1qa1q9ksntl14/rosidemin.pdfIn PDF document text
    • https://bunianco.com/other_files/File/mepararuwonigubudowawabi.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/woregarapozesotobejowi.pdfIn PDF document text
    • http://abnicum.com/files/file/56207985843.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/84084980934.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1812503dfc---pukokemuzexojagazegi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6acf9a29798deba5f8ec14a14484dc10/jusibetew.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/9522651230.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zezozitefunevatakokipadar.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_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 18676 bytes
SHA-256: 47b12ebb1dc9d4e0843e7d75f067cb7f0ac588f0cfd6670bb6f7d9efa6830dec
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 11124 bytes
SHA-256: 40c5c7a57c57ca6dee91a04a0f8b163239968089af70c22d48148a7d4636e948

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