Malicious PDF — malware analysis report

Static analysis result for SHA-256 e601b9aee582fbe6…

MALICIOUS

PDF

88.0 KB Created: 2021-07-30 04:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8af461bae3c8edfd3cf837a5757d40f9 SHA-1: 3548c6c7b86a087d1910ace01f8dda2ecd374b4b SHA-256: e601b9aee582fbe665fca9629455d326c349ded182e4ec96436ea63b3a908770
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, also include several unknown reputation links hosted on potentially compromised sites, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42e6e4456---25018285849.pdf In PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/43236065020.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edeec4b2ff4---kufefakomikarazeb.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/lapapisatonadox.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d6013c7cc026a701848dfa19c8348aa3/50492236920.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/6912387842.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/802e9aef990bf4b5e00886025b17cdae/zatuzuwetefapila.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0e0d73d479d501f729ad1c0f053c8b8d/revibuwuvujujimofakade.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/46054608550.pdfIn PDF document text
    • http://sieuthibds.net/images/files/41877743029.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a88097c6353---kaxigimufufizegaribe.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8d0037a8---jidawubedux.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/64867428365.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kobigazivexagugatizov.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/misejixelerader.pdfIn PDF document text
    • http://teraval.cz/res/file/77246008639.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9bc6991a0---45809231141.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf2936ecf1---6435056670.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6bc395c4a---totekezebuv.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a48b79a6---rofuduk.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/85751581099.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/65100321393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=plano+de+a%C3%A7%C3%A3o+oq+%C3%A9PDF 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_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 18832 bytes
SHA-256: e77d85b7c421c6f9229278af1d748a99eab9ecc8539fbf9efe2c31f30a9c4268
font_01_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10548 bytes
SHA-256: 9e73d512590d7bf8dacde8b815537f7a8e751c374abddac0f52fe619efccb8ea
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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