Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373c5ecc8899adb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 05:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f92b0922d9685496ff3cc2a7b89441b2 SHA-1: 79f6840163977d4f7c090ca4c45ed5d67b73b5ec SHA-256: e373c5ecc8899adbe31ccbcf4991a501b616aed712fe79404abfd3e1a9a4efaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites or disposable domains, with the apparent goal of facilitating downloads. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=download+mobomarket+2020+apk PDF link annotation
    • http://vervesimuhub.com/userfiles/file/zipebesidul.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/dowexininoda.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dunavegiwabil.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/vojul.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/dofor.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/42748756285.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/89576184490.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/67916739490.pdfIn PDF document text
    • http://schokofontaenen.de/idata/defiwuzafuzajukopa.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/69283616380.pdfIn PDF document text
    • https://eventaipei.com/upload/files/38779896734.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/zirisikoxabevifemesu.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/40546042459.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614305dca8e94---84571323874.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fb5874df02952f84e5589d6ddddc12ee/40706145453.pdfIn PDF document text
    • http://sushi-belovo.ru/files/19103925315.pdfIn PDF document text
    • http://aa-nusd.jp/81130123197.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161391f236df0f---89910394332.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/zonebutoniwalojufafiveme.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109130123235763.pdfIn PDF document text
    • http://hoachattn.com/image/files/7442978132.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/85660637676.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0cc3534d---felasalaputulozatev.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fogofaxiz.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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 10856 bytes
SHA-256: f6354fc7bc47017e0e1910c5b0ae7782a2942e5be501e2a81752ff5c3b6b829d
font_01_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 17764 bytes
SHA-256: f7dcc5d89b2e84f5151536a7eb882db790e8300c0da7d09a9f2408e22260aaab
font_02_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1