Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a657546c3e8d78e…

MALICIOUS

PDF

82.6 KB Created: 2021-10-07 20:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c447991586560591cf3058cb98337f8 SHA-1: 74eef0f3843e8ff1ca2dbcccb59a28ab4b32693f SHA-256: 5a657546c3e8d78ea2d97fe3acee3b54ad9bec66a03d114deb3c9fa22faec501
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions. The JavaScript likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These URLs are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=the+book+of+yields+pdf+free PDF link annotation
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/83065444080.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/73158703539.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pinujojetegitexonuto.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jirotufekizinakikevezavu.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/73351445130.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/83759492781.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/43987936386.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2de83b0c8---xedozofufir.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/44258801559.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cb8e6615c6b7441ff58b2543977328de/rabuwarosapikivevuz.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/dilaveresifuwabawed.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/28651495160.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/moranabukesekufipijavew.pdfIn PDF document text
    • http://dentistturkey.com/image/files/70966172566.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/78583170391.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/fupevukap.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd529f228---79848890185.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/44399828205.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/koxonivazafetafikipigex.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143364a0e090---faxupufam.pdfIn PDF document text
    • https://loctra.net/userfiles/file/ranenedipupupe.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/47031788021.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/46205210239.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/64150732525.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/44033597379.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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 10540 bytes
SHA-256: 1baef1cde1c59aa485aa2bae7690e90565ff6496a75232c1d1d14aac8a77b62f
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 18120 bytes
SHA-256: 65457d7c96e65f3c1dd936ae4a98525d2e01359b537e8e87f7a892d6086d14a6
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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