Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91ab8d67158a674…

MALICIOUS

PDF

98.4 KB Created: 2021-06-29 12:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a6805faaebb68ab0cbc4e28de6d9b716 SHA-1: 7f349166b9d4f988e3f043109d9ff850d6ab1b8c SHA-256: d91ab8d67158a674cae58666aa5a8980a5b67b77dc8d42c6c11270e303d3416d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e7cd133f---newom.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608722e14508a---sokodawubopekerev.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6p8jbgptdn4cgfv2jqe7a9h6n6/60494891367.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/495985571.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd93033861---14824883485.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/45718416091.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5fd5e8a47229f41983ab864fb0b8d48a/lutuvakelun.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd4bd8388---881614114.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ot2or5pm22k6j4d9nfup4jajbn/jixivodux.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6d3e700afa85139f7848f19f790b509/66324035363.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/joridovadugukixabijapig.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b158b42fa1---38891839477.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1mi6du4pftrvob499cd4sqmqek/26297472745.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/juvukawunikuxeketudado.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/79423770226.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wuxujifenonisafufonako.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0hrtdmdj5jvf1un4h03eja6200/37233637588.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/50701479089.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/95498306364.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xojifoweretedilose.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3d8d8bac7111c6985b729bd2ff70c492/93772487350.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160999c9c1ac3a---47075886294.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/99289252894.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969d87e4a44---gaxofuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=10+khz+to+mhzPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 2276 bytes
SHA-256: e7fd828df257076cf7d28fbdce8ec8f7930e9ca836b1be3c71ab361c94e62f87
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 20160 bytes
SHA-256: b29bc0f81a1c058b4216f2440f400df32aab699f99b26d5aea674f572808fec0
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F3 16120 bytes
SHA-256: d67e846df74fae85413b4dbff1f372ead4194f122dea4de5c3b7eb34fa320503
font_04_sfnt_off0001663d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663D 9800 bytes
SHA-256: 31d01c97e744ecb2c7ce8b9877efbed91253930e83495d1be6aecb32af07c28a

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