Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ca76b407501fce…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 21:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73a623b8d3daecdcf4ed7ea5b47c7880 SHA-1: 872f8c26658fd014ff6a2ee8bd4d8f099a629f63 SHA-256: 09ca76b407501fceeaf98956133fa5bdc56a198a1c06bd197ff98a2a5d136b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple distinct hosts and disposable hosting indicators further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3308a563---tapalotonowanakurubasaxen.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/367652027ea9e33e4c9e5377fb9dc023/sagivodadidekugurapi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c462a2b6c97---vulonisazafavepixelojo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/27076754152.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1dee4ab9e---74814879169.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/83318c9491c597b0892c7c1707f79693/vepisaso.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/126655daee65a320214da022a028576f/32795754076.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ekjhjonicmut6sbe4fm1gdj51f/27130240687.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/bcd66e26edcd7428b4965c3e3ebecd12/19069857368.pdfIn PDF document text
    • http://palami.by/images/file/55848328123.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3653c7e2080b9a4a47bef94fb341051a/86320426566.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/52847587824.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/bojiseniboworigodor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607164cb8d8e3---laliwej.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u2sk8m9bci2olcgqft09q6a1q6/fadazumi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/118f2a5949ac7b104bfbde37008f9760/lefironixudalerumu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/102231227324.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a024c46381---fewuweluz.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cb7cd37f14bca24d43b58794e3528472/xaravigesijinazu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/iao2nke1ccjitqq5rcfjlulldg/70840459596.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/phqe84kjkgtq1stlrm50vut2ih/sevefovasupikirorajoxi.pdfIn PDF document text
    • https://majubesar.org/contents//files/vadivutol.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89310167480.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac834ac06e2---webasurunugeduviv.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/zeropipif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=is+space+infinite+or+finitePDF 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_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10380 bytes
SHA-256: ce73ca708e122aff43adde35a96e1ecd52710a83116d47e3a7b31456f68c4932
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 17944 bytes
SHA-256: a2faea6cdfa0cdce79df3c963213ca8f277b5c629bd2fc99d9f7c0efd1490e53
font_02_sfnt_off0001478e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1