Malicious PDF — malware analysis report

Static analysis result for SHA-256 a046b6b75512613f…

MALICIOUS

PDF

73.7 KB Created: 2021-07-20 12:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7fa301499d640b20491c9cbdc11dbc72 SHA-1: d6840adf463d7e460bf8f7a6518a021fb74c493e SHA-256: a046b6b75512613f84b21d78a5be41afe5de6c8886c2df47bac66bbb29b4d63e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://giasuthanhdat.vn/Images_upload/files/rurefegevi.pdf In PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fomudomiwosudiwatu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9461ea70097a5f19b0e1ec38146dd771/legesekozupidelewudi.pdfIn PDF document text
    • http://skncn.com/u/files/4241553588.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c996f14f7---58457286992.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/54386168576.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/76766f0bafb594bd0dc48be91482ce4b/munopetewikibosodilemaz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/subefodot.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a655a7a46f---25951639443.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3516948f47e92231f58a386dd692d4ac/38610475979.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dkn4qd09gsrifmqa6pcuqu2s87/birujupebajodamedaferota.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e95ace24ffb0cf491aa73048cdee3f0d/zuwekegofi.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/34551917235.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbb7dac91---92531891814.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tonuk.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160836a129d829---1137547870.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/92452819365.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e6410366---60308344446.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6ab53cafc---wogirigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=law+of+contract+book+by+rk+bangia+pdf+downloadPDF 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_off0000b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 18560 bytes
SHA-256: cfc177bab0ff8a79262b8d566d74a7a4682a16f2c0f73700ed4a98b69d6922d9
font_02_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10884 bytes
SHA-256: 662a64b3d7ae8f686b053874f5ad16946c205834f9903e49bb4e9f3bf9ee16a5

Open this report in the interactive analyzer, or submit your own file for analysis.