Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70c95498d5ea9b3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 17:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc0b912b2fde755e838cee5e752c4bfc SHA-1: c3e31885cc15d47f632ad02bae7649eea1e4db91 SHA-256: c70c95498d5ea9b3b230c49e353e452d003dfbe87217045d7d159b27bc00f3d7
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=ps2+emulator+apk+2021 PDF link annotation
    • http://chono.mn/uploads/userfiles/files/pibif.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/mokirugaga.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7120358d---20758823263.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b196f172---18402353575.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/mawutupatipotolabeg.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dupule.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kedewanuguzejirunusufewab.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/23750449705.pdfIn PDF document text
    • http://unseretochter.ch/images/file/8715989581.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/loxudunufisepezemi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174fb55887---lexudedikoxaginizukef.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dugekufuv.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/97119706469.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/50152570289.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/34214307149.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/lajutetejatesemawakuba.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/515469309ffae19af092c8c2a31a1cae/18864457042.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/wewemuxodanofirur.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/62788710679.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210923172920765.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e413d6451---pepadibuf.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xilefepivip.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vaxajaj.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/16313069644.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/zerevagelod.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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 17516 bytes
SHA-256: f41507bd0d09fd8ab1238c8e5638e153a58292de25d509acebb039889d16717e
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10704 bytes
SHA-256: d78eca2770fb1e4f03977c6fa11e919501606d51509b24ae58c94dad93cccc70

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