Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a2b23c46cf0ff6…

MALICIOUS

PDF

81.7 KB Created: 2021-10-12 04:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c586d2b55a0f050aa132281094cd404 SHA-1: 63c777d5871f287d48ad358c380125be08c19c4e SHA-256: 42a2b23c46cf0ff6965feb5f5be822287c95e17ac30e070a3316bf6f02045903
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links, some pointing to compromised WordPress upload storage, indicating a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into revealing sensitive recovery information. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c244c3481d---66723753127.pdf In PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/69109739656.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/78214524802.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/4997993984.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/84470575993.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/tonugerewofixikokol.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/14690212699.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/80979122121.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/tavupage.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/90311058619.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/32116855686.pdfIn PDF document text
    • http://philipsphotographystudio.com/wugifezese.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/42505633999.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/josexesudigaregufe.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/junedifopoluwa.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/92156962203.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25a8c9015---73589658300.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/91375548106.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/pirakiraxaruxugow.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/8232822670.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tafodulivisodipotu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615fbc85e9e00---ledovejesijasatarofoziso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=how+can+you+recover+deleted+history+from+google+chromePDF 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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 11280 bytes
SHA-256: f8fbb554231333c0020557e109693abf95bcb50f40cb78084b7298fd9fc3ef40
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 16584 bytes
SHA-256: cb49ab3ec0897a2a3d1e28965fb2a6de8e43805196d43e091471808520e8ade1
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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