Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333fbe2852606c6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 05:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56e9da6cc8e8e3ee95f06be8bfae1347 SHA-1: 9e11cf3471e9ec4f01c284bdd3ec554481d51862 SHA-256: d333fbe2852606c6f2f75b0f76b4fd9c683be08c563d9e6535ffb8b03140aa3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/04a0de18cfca5872af35768b2f386038/bosotupekojixag.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9929d2f1fd016bcf7f67a0b4723c4ccc/17225746875.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sjd84t79ocko4u9ajh5d025g35/71542103226.pdfIn PDF document text
    • https://hoavily.com/uploads/files/62443904216.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/14625650302.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/kajadurivebazaxa.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bifinitavenavelawebo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085332690955---lusazanawiraxefeput.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/zakemiza.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lsrs1imre33lra493tb55lsdh4/zagawesixogusugimosenu.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/8653480444.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ddms0m8g85n9435oogd28kpqqk/96391700710.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/podusalutezowage.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180834481267.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/gegodakuvanifefaxerara.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6741f056---tokaxepak.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/varatelet.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/mipivi.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fupij.pdfIn PDF document text
    • http://congtyvima.com/images/Download/15553779220.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d66095f7eb3d4622127a2cacdf980576/3003394820.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7dd8034d7697dab2b6d6440e4890f3ae/95952517292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=enterprise+worksheets+ks3PDF 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_off0000cec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 10472 bytes
SHA-256: f8e0a72a7f53f66e5f8e8912cd32835bbb62da84cfdd05dba6c9e9d5751cc68c
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 17772 bytes
SHA-256: 4308dd2e16772cd5cf81c4740e968ef2f99cce68eef9bb75bcb1736ebbde91a8
font_02_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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