Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e23063b95d16c0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 12:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d689d19da63ae4fc0f9505734934ff36 SHA-1: e69c438bbbb15a34bad6c4cde330fb1a30d3d38a SHA-256: 35e23063b95d16c0797c484dab4803ab692dd9730ca6bbb04cc1b5c9fc79637e
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick users into downloading an encrypted payload, likely to evade security scanning. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=android+rar+extractor+apk PDF link annotation
    • http://gearcon-eng.com/file_media/file_image/file/merogiruzu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ea5e375c5c25b933f0f5d8813c6df32f/nawakofunup.pdfIn PDF document text
    • https://svltv.in/userfiles/files/75705534580.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/bomuwagus.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/16215065554.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/bofadanaxi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/66213657521.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/26368063952.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/64398739745.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/pesozeboxujobajidaxu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/75647396105.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/tidipuva.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/22242454038.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/7886145480.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/mufutazevisenogunala.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613069bbcb83a---bawoxonimo.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/varubazekuduwowusuz.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/86208627091.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/49159080678.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/54957990601.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/dujovuwafa.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/29515942900.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/pulekidununojexa.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/roboxakifolajironakonu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d00cf0601---fafizusetiv.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 10468 bytes
SHA-256: 7fbee476993cb172d42a7fccd18a4b5eb8cf7b4c7db24b970d33be441fcbc963
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 19080 bytes
SHA-256: f509eb0ac8fa8ee5ab232152d2b373782ff6df9ea705ed970a6bd17b81cf4d46
font_02_sfnt_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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