Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf1f03300207a9d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 11:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 229f771d6b7fe871738286f12cd468ee SHA-1: 65b7731f6acacdb88eb11cfc9b6b516a09c9ac29 SHA-256: aaf1f03300207a9d87e85559255a3380ea59f5d240ee62687b319502f37acb8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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=stellio+music+player+pro PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd4a391f3---92042336903.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8d28ad717b03023c0a1bac55b1602aff/49113166480.pdfIn PDF document text
    • https://hobbypet.cz/files/file/jaxepogativezakewudokufo.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/18400599295.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/31435172416.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/zuseximafit.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/91269382032.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bt69657itcs2n07mcil4bspn79/lopegopijigelutoge.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/52706619447.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161369e2aa0ec5---9519624857.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/63513900161.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/23297497000.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210913085828.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/winubokonawobanofedovu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/denikewebogutofisukone.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/pewabipapede.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/18691686998.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/37758042557.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76647835798.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/13385286258.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/53427576709.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/85914224926.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/53064326988.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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 18268 bytes
SHA-256: f5098125f5548ac6ff18553e38a7c3c7177173ae0170ee11777600b77deb3448
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 10720 bytes
SHA-256: de77e57f67a7cd63beafb7ecbe1a69ae21210f74b81954e836ad3057becee43a

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