Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf48b83e51125fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 17:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69f87e78b9d5cc55d1bf74a5ee0b4733 SHA-1: bd7bdd4fbba4aa67d98fc792aff19a887dcb1490 SHA-256: cbf48b83e51125fb37443796d49f16c5a0467fd0b4eac453f56ff3a59cb4566b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=enfermedad+de+parkinson+y+parkinsonismo+pdf PDF link annotation
    • https://okna-stv.ru/userfiles/files/bafadanunu.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/rmitpvsevno989mg55n0oenipg/jarazagererosi.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ca0bfec0---48450336409.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/55271228485.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/57785357908.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4cff3fea4---55679258761.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/mowibekal.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff7f79e40d---fukaxola.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/mafunakogedipasuvob.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/38468080314.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/eb50f899ddae1f274f6cd368af08497a/48468221865.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/mobalewuwadunexisomarakis.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/81110366252.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/45528912910.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/194c681524b908997a15a85445e79a37/kibaxutubepaxevozu.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/27097362412.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a9n5l6ohvmlsq2lp1h8eo29n5t/petosuseze.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6iqkgckiuhkio2k6fj2uobp84d/supixuwimoguvetiwu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/76410764001.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/4101777614.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nutisikefalotufipejala.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/62745e956fb01b49fd5924ebe1730eee/wesumolipitites.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/02v314qiu1kg4tlucgs97ilki4/15750440766.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 18112 bytes
SHA-256: b1d9e037316291e6a8673acc1b531f6943c097fc425ea9e5d18638447bca593d
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 10704 bytes
SHA-256: b391166b8dcf9632b81f1d08e0934c29350e03e742b87ab31876e794fe928f77

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