Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f163d8b28830633…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 06:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41f4ef0e42179d1f7e8d73106a829a44 SHA-1: daf7642c9eeb2a6253b7e81c910ec20b03c6c09b SHA-256: 6f163d8b288306337f014d33167a719a48ced4dbcc85141be02f9241b3e010ec
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading potentially harmful files. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=chhichhore+123movies+download PDF link annotation
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/gevixesadolisosim.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6c879daf---jikukawupibukimewedigab.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210912_193145.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/024cbe0b8878126d3b08cd8909dcd91d/vevobiwitomewegorug.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161375081493ce---selowulekasulukozilaloza.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/juburirok.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/31470734718.pdfIn PDF document text
    • https://camelcarpet.org/d/files/rulon.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/97589553433.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jabatotadaporaxib.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/81069005513.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c22bcd5c---bepepujokanuxomumit.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/rufoxageve.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/33857809785.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dilebiberoremoxujadupo.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/77121941675.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/norajidufupufikojozezufeb.pdfIn PDF document text
    • https://anaksemut.com/contents/files/73543769488.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/dipemo.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/63647352277.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/53103229108.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3767309326135d8242dc5c.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0397795001631142114.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/21584566706.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_off0000bccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCF 16316 bytes
SHA-256: 9227a15eacdb42e32c1ff8c0fa01c5b80151f9e1e6b63b353cf12b94d3491aa8
font_01_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 11064 bytes
SHA-256: 40727404ba2e0c445e74ad705c1dfcc539b42faad5355266924dc43d63b3613b