Malicious PDF — malware analysis report

Static analysis result for SHA-256 1582d6f2c8fa4a53…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13b66a9093db7947b4b22bb5972ddbd3 SHA-1: 4ab3aa137fb3999fc1876c63bb62a3d415992943 SHA-256: 1582d6f2c8fa4a53e01a3c4270a3b16b50697acbf9ad5b70f372b4abede69ba6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://terminsk.by/pics/files/38629959763.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7d615b181a42bd15ee338ff59b045ad/9979659072.pdfIn PDF document text
    • https://kueapem.com/contents//files/sawilinip.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/lajaloxanuxazu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/mowabigi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/22200136175.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684a727f22---ribuwadagodavobilozikijet.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/tamuwasukejeman.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/753db530b281ecebbe9ee2488dd63657/rigabajazerej.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fe3ed145---29035291163.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/gozasati.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eb96f0257---64392553051.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/noget.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b603f8e9e36---kolijupuvumedakarenifaz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5kjvg37gpsc251ciogg3d22l6/disorupevilem.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/wugazubivazido.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/h4h4vul4hcmni597b2c5qm0gc3/sewozanavosokazenevufexi.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kamopawabosixalilase.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d0cd56cfa2665a1ab254cd1fd946cdbf/76228275602.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e5c081b43fb49ad51ae0c7c008e2fca/xupezikimorol.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/90178231045.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90c12501f---58306324995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=informe+de+reconocimiento+de+materiales+de+laboratorio+pdfPDF 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_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 18612 bytes
SHA-256: 098d0fc35becf4faafc2c4dd7261cc71c7c03061629dd2e1b9a8ebdca2f422e8
font_01_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 10872 bytes
SHA-256: 5f129fc76ecbff42c1d94d4393a6f07e1f87c20410e84d6e7196089ad0f437a0
font_02_sfnt_off00013326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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