Malicious PDF — malware analysis report

Static analysis result for SHA-256 b375b8bd5c3368a4…

MALICIOUS

PDF

74.2 KB Created: 2021-07-03 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cdcac63ca770fe7a41adc93c461321f SHA-1: ab35dfc66222d872968f61ac862624243924c2f5 SHA-256: b375b8bd5c3368a4011e7bc71ac566ceb4ebdc48ccc856110b749e7f7bec4142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting it is used to distribute malicious content or phish users. The sample's structure and the presence of numerous links indicate a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://archielectronics.com/userfiles/files/74741629512.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7754ae7723---gisom.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/busojumogum.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a77f39b377f91f5e219519d8f65d89e8/xaroxemubuputekedifolixi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5f7859c0---84413493933.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c15477e22---40556440601.pdfIn PDF document text
    • https://banghenails.com/upload/file/15447850599.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/lasezipowaligekenaxopuw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b084474f0---xasotaxopa.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/73a117b559588170a3b897da8bd72b2f/71753901923.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/31514792209.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/juvujazuruvawiwawa.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/98564003071.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/20322866186.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9n6ti4o72qgkpjnqlft1fcksqg/gefofewapojigebiroxe.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/25219022030.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kemoxorupirufokumulaxofo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/850aa4b4232f0edc19e670853268c3c8/kidot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ur3aitvuf7i5f807lskpoft2b0/51937697275.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/fuzafekazimururibotek.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4l91ccom2a8lckv508qerefn23/90324212093.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/72632351859.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/75770156523.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1380afcb---jagogazifogelotedewadimel.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/958056020a7a088be7dbd1974169d341/jorimowonanabato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+many+cups+in+56+ouncesPDF 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_off0000c073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC073 10884 bytes
SHA-256: f680506b29fa74ac541b95cbc51a6ce0e9415da44f75faf1c0b89bb4ec6726c9
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16116 bytes
SHA-256: ff852f961d837069bde82261543dc3ad473bb9f892ebde888ba7110c97916cf1