Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dc2a4de035ca79…

MALICIOUS

PDF

101.0 KB Created: 2021-09-02 05:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 763e58ad4247245609a7d733bca88a86 SHA-1: da19ffb3097f1e569de7fe3630f3a6ae3933f2d8 SHA-256: 36dc2a4de035ca793a54d22220e4137e37746456106914b97ec418e4fad25cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/89b74ddaeffa4e18f994357e2481d3de/linizajiwuzirozaj.pdf In PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/topotobutatafujijinaneta.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85267779770.pdfIn PDF document text
    • http://learningkey.org/userfiles/pexew.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pusanulufoto.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_0A275209E034B8BD.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/fanapuvudiriz.pdfIn PDF document text
    • https://brod-plovdiv.com/images/27652845831.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d210da03cf---xivuluvalu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083812caa89c---woverumafudufup.pdfIn PDF document text
    • http://altus.pl/userfiles/file/dixoresomivovuwupune.pdfIn PDF document text
    • http://mfcpavpos.ru/file/84396574378.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/59844904009.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/13819903486.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xebubetesetanekok.pdfIn PDF document text
    • http://chromavials.com/d/files/wunivuliwebunavajojuko.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/23581573141.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ssa2tk9sbebsin8j8m3sbllvb1/38719338715.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/6086373160.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38c308fa3---vebeperozaxatubibebiduwog.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab9c73ad3def291f30fb84fb4bdfcd57/13277365304.pdfIn PDF document text
    • http://lecostationery.com/files/file/vivetigamomegipo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161289cd4ce2e4---46119975418.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112a466ed1be---zodidovu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/79528273521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ron+protecting+hermionePDF 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_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 10492 bytes
SHA-256: 4151a6db9f49caa63a8a8fd022c34c89d52d3a67a0cb0914c6758a0994b9e06d
font_02_sfnt_off000152b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B1 19540 bytes
SHA-256: b552e84cca220f956cd335e52957c17eab25b959eb12a9dc176ae547db447121