Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f51b5f90a8c9f95…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 07:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7ffe274a033c0e120cc825e6d9a6cdb SHA-1: 8ab77b711faa94fc949633e05961af77020ff854 SHA-256: 3f51b5f90a8c9f955dede897348116d12b26e79ea5ce2b7bd38725436e2152ae
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://elitvorota.ru/f/file/62446043206.pdf In PDF document text
    • http://tcsm62.org/uploads/news/file/28589815791.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f460466e03---94655091042.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/96253957448.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/garixepu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/81560751486.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/43454003347.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9868290f64904aec885e8d8632940503/zasugoguwoso.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64319817023.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fevovol.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607096d362c08---zesom.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/43994686703.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/27a5d1f1e2863266d9f50a12d9cdbeec/sisorenatutegoxe.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66646719058.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/23479083787.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/3u53b6csqknqbn0j8980qblvoo/87888985208.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3f91bef3---35507617707.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/3250759080.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/74473150293.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/77908095186.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517160008149597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ningxia+zyng+pdfPDF link annotation
    • 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 10260 bytes
SHA-256: 482f419c4beb39ceb1590c8ff52e9f2a9c3aead7859744c89742a894020c5ef9
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 18844 bytes
SHA-256: 51db2d6a303ce4397a798d7d9b7357bd686967d23dabbd4a57948eacb1447c20
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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