Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd8e8bd8e763b36…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 19:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60423dd2c707bcfe65205ad6dc1e4bd0 SHA-1: 60d24c290dafac5fe6d9ba33bd85156985f6f8a5 SHA-256: ccd8e8bd8e763b366551556fb97960262a6ea8bceaf582a41aa96b35517a5183
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=unturned+plaque+id PDF link annotation
    • https://fotoprint.lv/downloads/file/83006727795.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/fewetofokela.pdfIn PDF document text
    • https://hinaweb.com/upload/file/77783959596.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/40944971260.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/93467840367.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/486595974.pdfIn PDF document text
    • https://csn-alliance.com/data/files/92662973942.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/38854047810.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb15ecdb9---bonumutitirirosajasukeka.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161329a6256425---6800642509.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/31263352321.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/87727716121.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/zulijugavanorusutikotin.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/39790651329.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/fufudowisidelurudebaw.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210913011402.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/vuparinonow.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/139582513.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/4242400686.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/xabomupu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1e334ff6---26043967800.pdfIn PDF document text
    • http://citra.cl/userfiles/file/jolukisuvebiputoladexoki.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/19135832842.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109111549171910.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/69843306471.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/90802315889.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161458198e5a28---lelenoluzaziram.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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 18072 bytes
SHA-256: 52ac114a8edff8f447ba591173911afc7ec1e86c5c821174f5085fc5e2f51336
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 10352 bytes
SHA-256: 17def279a0c97351c16764aa1bc84bc93f46d38c279f4d0bd9f68ae87e36a069
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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