Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2e832b85b417a0…

MALICIOUS

PDF

81.0 KB Created: 2021-08-25 23:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 040fda25daebd331924504316346ef90 SHA-1: 4670ad80382f32b13eed4f56dbe711d18845a349 SHA-256: 9d2e832b85b417a06954076038943a08ef56eccfa319e4fdf988dcd5920c9610
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://airfa.it/userfiles/file/69203692561.pdf In PDF document text
    • https://lwim-ouargla.dz/ar/files/lobesaremajowobeziwukigok.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/30401005460.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c47cc463c3311822ff7dc77a35fed0b/dinovisatifitujibikudok.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/2715558893.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zufisirejebewaxorizowutib.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1072b7e2e06e4b4cfc5f43ada055b999/30829363333.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4aaa3e10676e0f046c8b9a93d64535f9/25230264731.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f508f370---74497022048.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/bebejebibepogur.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/769f301e47a5c551a98b9e5b79ca8457/semapotikituzozi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13dd9b32e4---28107967276.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/89865963573.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/okgcqlmh803pbd8jestgcicke3/54445038808.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/266947c66ff6e6b3a4d7665b835edef9/6946974127.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/25190865671.pdfIn PDF document text
    • http://navigator-33.ru/media/file/dawagededosamozip.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b57e80ee1---26540159611.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/25234620046.pdfIn PDF document text
    • https://bachson.net/upload/file/gatemuvonapetipar.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/91660138201.pdfIn PDF document text
    • http://elskenecologie.nl/files/53026300622.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/jifenodon.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/riporawosagitisetakibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=yes+boss+all+songsPDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10116 bytes
SHA-256: 6060e796dead4b671b02b3694affef1de4d9a2613511941a9ad8250f204c5af8
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16360 bytes
SHA-256: 7da5ce79c2a8d2ad661cddafb05d2c05a0715e6bf4669b3d79cc6df131361b87
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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