Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d47e931c9e253a…

MALICIOUS

PDF

80.6 KB Created: 2021-07-13 16:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a64a4dad7faa89be0c6a0ab8a4219b9c SHA-1: 29e505fe051c1f0e6d2b383b1f99884ee69b7641 SHA-256: 37d47e931c9e253a8edf8bc63ac56250f26e6b83092beab0cc97b89114bb2622
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad52adbe6---58762906149.pdf In PDF document text
    • https://poolpoint.be/uploads/file/zugejad.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c7d18d4ec9ddc337033e39f86f67ff8c/wusiworarimukafex.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608034838aeca---85181205199.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ad3c1ff---ferakakuzetakorub.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d8k35tc8n8a72nt0c7i3lircv6/70720506826.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/46326786153.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ad29c96---46575837573.pdfIn PDF document text
    • http://fullprotec.com/ckfinder/userfiles/files/tikofigipomiwine.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/duxavevopi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fa9588ff7---48938052048.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4b51e75e0e8f53878ebbe1235bce7687/74343411022.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-22/20210622154956524831.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/simuludafeviselelil.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/12989992917.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/gamunagabalovewekunaluk.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/84624288858.pdfIn PDF document text
    • https://aedwea.com/upload/foto/65007252970.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sofokelini.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6b53a9fd879bbd470c6bba6bfade6720/tirup.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720eb978002---zozovomarinewutoxanun.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/56a581680154771494d5434b3234815e/40061105413.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/94fb2c4808c3a77ecec162009ee14859/vunilivola.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b81f76e92---dusakujipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=convert+from+scan+to+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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10740 bytes
SHA-256: d1ea72ffcad0f9296c6e6ad753d92e1d34b32cdd746730988ea0cb1d8dc568cc
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 17776 bytes
SHA-256: dee22530a2d5a2fb850f4b45f200eacc79f2faa9faa016b6d8617bbf67f06f9c
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1