Malicious PDF — malware analysis report

Static analysis result for SHA-256 38426c0a319eccf8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 06:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c47b4bd335470e0987d152b9caa82702 SHA-1: b32b0774198b8ef97aeb63881e05244c1b1d978e SHA-256: 38426c0a319eccf85b459452dbac7df7ace144fe0ad2060e9f53fbef30c0cc55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to host and distribute malicious files. The presence of a 'download' button lure further supports the phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160944290dfac7---81396125697.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608696bde264d---97854178440.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/27357694645.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2f6328d9f---35115084790.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/jovipogupaxozanevawidata.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160782852d3fd7---19608645567.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/66863806473.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/13236478505.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab973346bbce330d2adea978c18e7141/9645751015.pdfIn PDF document text
    • https://doganagolosa.it/file/28114812202.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/85092322150.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c47190ea3---27129867433.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/keputufepa.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/fefekozonisoworanewazege.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/91255116364.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kenileg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+neufert+architects+data+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_off0000b841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 10904 bytes
SHA-256: fb534c86fb33e04a7ffe294f23612328975639a8030feaa7d0ed7892bcb790a8
font_01_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 18660 bytes
SHA-256: 70bc635df6d2531a3b0b7e9d3a1dc7f725d965e91c2d28710ecaab83d10739fd
font_02_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1