Malicious PDF — malware analysis report

Static analysis result for SHA-256 23640ce26f408ccd…

MALICIOUS

PDF

85.7 KB Created: 2021-06-23 06:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1208531986916803c7dfdc7fee5fafd2 SHA-1: acb2170ea264c731b59a025334f352ef12ab6206 SHA-256: 23640ce26f408ccd7dc5d0b1bab18e3b796ec3c50ce9f005d4b76ab21cacae37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

Heuristics 6

  • 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.
  • 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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qtjfb9k59984ih7lpf2a1g5njb/nolifisesaru.pdf In PDF document text
    • https://betentour.com/sites/default/files/file/65911568081.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c690c8904ee---23332468850.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1a130f40b81b4fcd9b92d4e4a39574c3/kanodugejodininep.pdfIn PDF document text
    • http://petrduchek.com/files/mugidugitojagipisebojapo.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/17990718048.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lirtoqvutg9b3l5rg97v19r66d/dorevufulazulilazu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0c5vnkphr3l66879f02go7tgsu/wasinuritotowonarav.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a740b8947c---lekerewivotigokosudos.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/3024934528.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d5b15a89cfba483c924d70a8c5cc73eb/9756171050.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba49d5f68f---wiroximokudusumonobuzava.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46239f2926---64375283789.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e86a3e0f0420818ba7ab13a5e7c217c4/45026891995.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5d24d7e8bb9078861bead6a437d3d4c0/1200997945.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vofijujosuvuxef.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/noloj82ign94l9ergvk42e0gp6/ronogolinedafo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d6994c0---nodifojowaronanebesuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pixel+gun+3d+free+playPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 5368 bytes
SHA-256: c5ce5c74d31acab6e2abeb26d0fc31fc41e197aca9aabf12da032f9bfa78deee
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10288 bytes
SHA-256: c6a6dfb73a404c3b7f1432183ee936422ad04dc0510fa6b21c702d5556826313
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 11384 bytes
SHA-256: 68428cd2b71ffa9ca958a19e8a0988209bbbbd6f34ae6473121cde8b7af9affb
font_03_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 16488 bytes
SHA-256: bf3dc23d493d66d2b5051eb8b6683e6f0c1a9f6dc43a9d27916d8cf6a5f1f199

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