Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fcc39b674af83c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 05:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 295ab79da5540606bdfc6ca54782365d SHA-1: a9493cef99c91c60648cf005cc52135fb3443d4c SHA-256: 64fcc39b674af83cf0030f0391c6c4ddf13fc9e2550e16923df409bb68bcb660
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=how+to+make+play+store+default+app PDF link annotation
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/p8pa9btnvc9846bfv42lmhucd0/5773709774.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/99673537260.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/38ea77cd25a324c7d4b939147882b362/lovipepaxewagesipopijo.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/71986777903.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pekasewora.pdfIn PDF document text
    • https://orrizon.ru/images/file/ruzomukokupawiru.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/12967349180.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/vuxineredepudavuxuwobitup.pdfIn PDF document text
    • http://findusafranchise.com/files/files/tejemanimisugaparotewot.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/lufovidesutakazifixi.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/160756595502.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/siwubex.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109131421329142.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142652c80cf9---wagavowivadujowurevived.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/resilowipalunujotonuda.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cefed94b6c3ff79840c33eab3deac47a/zanudumudap.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413359892e6---tidisotejera.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/kotidibuzinag.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/kodubok.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/47009666598.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/94962918519.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8577af2cc---dajanaxidesujasabu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210908225135.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/befobubuj.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_off0000b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DB 10848 bytes
SHA-256: 3989dda7de6534a9611b7339ff74e203a913ce4efc1cff688a4eb4b8540b6941
font_01_sfnt_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 14780 bytes
SHA-256: 551fd014c03a45fddcfbfd742794a662d5905e0e92cb43a5f21ca7727f1565a7
font_02_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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