Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432cd2b46c68526…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 20:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa3fd7dc13ce3ee74e6a59b5be0e4637 SHA-1: 450f881b96fa5857931682a036d6f7aad0ddb976 SHA-256: d432cd2b46c685268ebef08a58c445fb18cd8754b652eda4250deb06d63b1d92
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains identified as compromised or potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct user-facing content, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bawaconstructions.com/editorData/file/8514996808.pdf In PDF document text
    • https://sagarexpress.com/userfiles/file/sovumego.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150eaa544297---bedapirikoveli.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/tujipuvafomusesaz.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/nuvevugizewepolu.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/2629905855.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/63801191290.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3efcf867---12470484736.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/36705841464.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/mamozegitinezedofi.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/zuxadiwisojesuxudexete.pdfIn PDF document text
    • http://yuli-china.ru/d/files/tazitixijixupibas.pdfIn PDF document text
    • http://sbcnepal.com/images/file/jatikaporiloduges.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/30962740239.pdfIn PDF document text
    • http://fruitsad.pl/images/file/76113389891.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/77813412993.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/najoseso.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tbmbccu8sse49pefge44tq8g2g/34049180965.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/75648950765.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/26178477486.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/gutozerajosabesolituz.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/90589735317.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/92729769187.pdfIn PDF document text
    • https://hoavily.com/uploads/files/fulojaxufodeta.pdfIn PDF document text
    • http://podushka.by/files/files/kupixibaxesusup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tboi+tarot+cardsPDF 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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 10184 bytes
SHA-256: dd781bc3ec300796a2f3a03d5993b568259cfc958a32265fab853862d8e0746b
font_01_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 16036 bytes
SHA-256: 3a87459bc269b368e84047564af117e34bb4433a9bc7e6aae35b66c2e7ce8991
font_02_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1