Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcabeb78614a2305…

MALICIOUS

PDF

92.0 KB Created: 2021-07-14 06:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 02a4ab0f9d3e325a8651597f88b01f46 SHA-1: 3795d963406b7bfe69dd0efb51b7b5c070d109c3 SHA-256: bcabeb78614a2305585401b62b06c09d9e0edbcfeaea6be9611000777ce4f81d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is used as a lure to redirect users to potentially harmful content. The presence of multiple PDF link farm heuristics further supports this, indicating a tactic to distribute malicious links across various disposable or compromised hosting platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=best+red+apples+for+eating PDF link annotation
    • http://paillasse.hu/userfiles/file/kunurofow.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/74mes1rvkn23uj5mnr7sd66rr3/vogozezilos.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0e1c07028caeb061ce415d772daab9d5/98796103257.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c0b3ec471dc8faec576284fb9d99ad31/43841318937.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/a419fc1e452dd10c6708530a73b67921/35693549210.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ed63639139e---gaxetejemukevipuf.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f7369e74---vokadetovob.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438b4b27bc---21511570525.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/95295023761.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/89ac41f4206882f088345b2a3e8dc153/65609421051.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b207247a8f---64412787289.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wufogejasafovom.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wajajesubosamipas.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a331d652c0ec287dd7d60d788509debb/8639881892.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c870452267---jaxejarupogefosivof.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zaxipimi.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a71a94f59eaf20866300d0ed2a0e4509/85072227071.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/19t44glf4bll7k0h5upscsbdn4/79206535479.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/lvq873jhpp36a6b7urju7aomb6/22404707900.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gadevovetusikedorul.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7308a0469---kezezo.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/92386537372.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/19bacfca752225b97a31c3b74580311f/gesakavoturux.pdfIn PDF document text
    • 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_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 18932 bytes
SHA-256: 0d92189e0d3fc81259e5c56254e8abb274cd7394492beb04c2a7427eec616862
font_02_sfnt_off00014a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5B 10728 bytes
SHA-256: 1f13f134376c65b3ce42ef78a49171a55241a4d2d0989c5eaef0255c67a7cdd8

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