Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc174c08c30a1e1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 20:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db972af55d87513c4c45c2284ccbb1af SHA-1: ea833c27717f88b31ff8213d2dfebcf103d06cf4 SHA-256: 6bc174c08c30a1e12f3c1eea69640c603b886ff9c2fd860b3ecdfb2c8e09eafa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a 'download button' lure further supports the phishing pretext. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6ebd097157fbefc6e6c4384892bb0fcd/31567714086.pdf In PDF document text
    • http://guowangcable.com/d/files/tekaxolejurikupurofena.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/42517042518.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hahkdvfh7lsbe9r9knkf3b4er7/rozudovofukawuw.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb06d03ba9---fisofawatovo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6af452f49a---64531241861.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f7c4a963---93279642150.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/41638322955.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d9386d74---75177766667.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/051207419931.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8e22cc2a3d1deafaf5a020650ab390b2/99000905635.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/72241089790.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/1162819219.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf0c3d03a---40495165379.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/xogakotixudiliti.pdfIn PDF document text
    • http://garderoba.sk/images/_file/727595848.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/silijinisudulape.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/19fed183da26a28710c1ce5a8e4b7a4c/8444519410.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/82011467304.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/91759306488.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fe00927e---93101968577.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/gazatefakibujesid.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/biwemagujogexosinuf.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/wokolujirizek.pdfIn PDF document text
    • https://drsaman.com/files/68270289539.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f33c84018---34744343480.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femepodugimaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=types+of+optical+microscope+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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 17664 bytes
SHA-256: 800677ebf0e05c94aa65ef60fb05731ffabb27f28de52d77b6b7a6693400b3ad
font_01_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 10752 bytes
SHA-256: 0f3161c3b4156fe0400c0d38cf571b22288f4f8b213dd51a270e93a6152cebbc

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