Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbacb070ca5dfb56…

MALICIOUS

PDF

142.9 KB Created: 2021-09-05 14:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64401495db0259e7ce7745f7ca69e587 SHA-1: 3b4ffbb07a1d33cc0fb638e7c139a8efcce6ecdc SHA-256: bbacb070ca5dfb56c8da7edd19524c83b990adfee432979effdad3f32b013506
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae0fd862a---suwizusen.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/47089512706.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/zatorirorog.pdfIn PDF document text
    • http://halmar.info/userfiles/file/gugomojam.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/10291852265.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12053023142.pdfIn PDF document text
    • https://777mto.com/contents//files/6269155033.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/kojorujid.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/vodojabadovane.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae4b2b163---buramosik.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/pinobixev.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2ae6ea4123fc59d7b309d0d4fed067c1/16852612691.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210726_160621.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/22055613705.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7d5b48df---nolusutux.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/koziwejorusa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e714d7c59c---47833280262.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/69566852077.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4b9e813e9857b09130dea9b568e757eb/sokudinaxikafeme.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896cd692a4---79674660974.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/temibedipawagopolij.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/96294953188.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9e3701aa---pezofarexugapem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=alprazolam+adalah+pdfPDF 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_off0001d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2C5 10208 bytes
SHA-256: dc8669c00ee6f01d5ea7ef95a5c24a750d0c20787228364eab62a664612dd220
font_01_sfnt_off0001e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9A5 16888 bytes
SHA-256: 1bceff739dc773573a5432e7779c65c01f0e9f7501a59660a1c6eb0d04707e9a
font_02_sfnt_off000215a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1