Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb822c0be204cfe6…

MALICIOUS

PDF

92.9 KB Created: 2021-07-15 18:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b5d3150751da24f33447498f54fadb4 SHA-1: 5e4a217b2f7752642c288d39cb0b920b63ca5880 SHA-256: eb822c0be204cfe69199aadf263c59853b7e9e0d04beaa1e6e49b176673b7c4e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=pilgrims+and+separatists PDF link annotation
    • http://ildungrice.com/fileupload/fckeditor/file/wawawidisajafadevejevoxix.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/rotuwubekovekulavafipi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a870a4d28b5---zolakekumozosetom.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/50101436f288f9ae8615f74201e466a0/vamipop.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/65920745887.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mc51uu8jprpa1skvkfbgqfg1oc/zerikanazevezotibanenu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/terisimisutuxak.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0e85eb7e3a8ea596787618dd372bfa/ruwakogo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/foq4rb51rn5vmppnjtjoog7gs0/20473492192.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vemuxutawuk.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/18251358379.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/g8qtfd5noj6bgdvolvde3ktj8p/saxijavekovomixubuzirixi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/xarazegekaxura.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281809236498.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/xakoralapugafa.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kogobagewebibaxu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b036ca49f6c---15423081509.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/saxagotukojixu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fba73d76cb882e2a0cb547089faf821c/16713250293.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b9j0tpjobq0c16rli4r867pii5/pimulutadedisogolaboliw.pdfIn PDF document text
    • https://serka.com/serka/upload/files/93731522472.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a7c457a54---toselan.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5de6f5c9b7db88e0d017bee91e110283/bafimamivunem.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8364b614c---ranes.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_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 10616 bytes
SHA-256: c96a760a2ca791edac9cf38802bce305d96eef327d757371d7f7e14850fe349c
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 17216 bytes
SHA-256: 05d11a90ebac71774025770b1d8037191ff6b12185e7770024da3ec77f33f465

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