Malicious PDF — malware analysis report

Static analysis result for SHA-256 98060517f760a4f0…

MALICIOUS

PDF

82.3 KB Created: 2021-07-05 15:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c169c6e9c14395b3bc32ee97c9e30d7e SHA-1: 117b8fc0ed01fe45b8b776f9acff472940310a27 SHA-256: 98060517f760a4f03a6164814c59a28cca790f1c20d872a2f94a965d1f430874
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit vulnerabilities or serve as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://liebherr-tr.com/userfiles/file/ratorigika.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c5dfcbd41425a4666c654e1982b41f4e/73175149590.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073b85dacc76---33947452151.pdf
    • http://architects-desk.com/uploadsfile/sakej.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/9085201859.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/48271202696.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/902115012f5d3195f1fb1699c4bbb0c4/19580146807.pdf
    • http://biirbeh.mn/images/content/file/34490840719.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xezuk.pdf
    • https://dineflon.com//files/17623649002.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/bacf2a87b14f4d92edaa6bb027167f2f/rojipok.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b207eca9b15238e99d76e0689614bb5/xizug.pdf
    • http://haniltm.kr/upfiles/editor/files/63033686399.pdf
    • https://nationalshield-uae.com/userfiles/files/gumerut.pdf
    • http://stonebreaker.at/litemadobizewibimowos.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43ca50d5d---83543924268.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e66bbcbfa380964a86853820bf9f1374/98031767224.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ee17ce09f---82363902902.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0444f8b4---keluvosijabupokivavejono.pdf
    • http://hesexpo.com/img/editor/image/file/12852201940.pdf
    • http://tanriovermensucat.com/uploads/genel/files/44763111347.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/detg5ghvf89r9o2vhnuc1f73r5/miporafewuwazowutemeze.pdf
    • https://hohsingfiber.com/ufiles/files/gigoxubutiravo.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/41016555424.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=airport+extreme+5th+generation+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d173.bin
7bd5453c4c4aa92fcf9f985ff6e60d19b8cd80c75bf86048f36475897e1e1918
pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 10848 bytes
font_01_sfnt_off0000ea5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 16792 bytes
font_02_sfnt_off0001026f.bin
8e0f1e92b648f1cd8ee8c5ff39d2d3a253088987c6ec6a84b3aafacb9407421b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 22992 bytes