Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f2b2e22c4194aa…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 17:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0859a68d1943f56046c6647872df5c4 SHA-1: 52488d869058890fcaa754faf9cc731ec626682a SHA-256: e7f2b2e22c4194aa6e250f504f653efc17380383e198e4b58d66144baf909d6c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://on-video.com/movies/movie_data/file/29842432342.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acfacab248---ladifepimumamarifowefep.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/24434549773.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/gevitotekes.pdfIn PDF document text
    • http://mayjack.com/upload/files/99957770316.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/48085426496.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/rapomavepajug.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a4c5add7---59781483382.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739801aa087---34871484013.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6af767ae903dc92fec47e1a01f332bdc/jevogawoxuzovasemo.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/78076782344.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/jofojapujanivapeboxamiw.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/87160477176.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/tuwozanojugu.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/24539311605.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/88782003026.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/65089633069.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/45069447232.pdfIn PDF document text
    • http://mamitobe.ru/files/file/22240025413.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/i5s8gk3pk9bf1mq8hai04bprl0/gawokenupo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/numovuxufenuxupiwit.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/kedezajexigov.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe828b37a0f---71205068951.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/23329531416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ansel+pharmaceutical+dosage+forms+pdf+downloadPDF 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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 19812 bytes
SHA-256: 02de3d7338d2039295357e4f0a4951b2a925e90db63119e937df1e5deb88b304
font_01_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 11232 bytes
SHA-256: 915bfdc03df4dd641e872a0affffb1bab42b66b95d6d92230b07b7ea108cd7e2