Malicious PDF — malware analysis report

Static analysis result for SHA-256 6662ed54dc9123cf…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 16:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975751e084346199c6a55358a94fa377 SHA-1: 84311bcda2cd3ded052a9a110636fdf58ab8aec7 SHA-256: 6662ed54dc9123cf6c9b2ea7dfe9c312529916c53c88080596b1889609e539ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=furniture+re+upholsterers+near+me
    • http://candientushinko.com/images/file/sekax.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/oosuhlopkhn28os2j4i7o1057q/22202329257.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6dsh36muv276pih7dnnddnld2/13278160536.pdf
    • http://bensonlandscape.com/editorData/file/38209985590.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ac761b1f---kevux.pdf
    • http://cnzgks.com/userfiles/file///mesuralasimaxupezabitun.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/45773325675.pdf
    • http://dragoniresorts.com/userfiles/nemikekaf.pdf
    • http://re-view.online/fckFiles/file/16330006349.pdf
    • http://zuche0551.com/upload/file/9639215554.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a1753d26---vowefewanamubib.pdf
    • https://autosaloncenter.com/uploads/file/81337032215.pdf
    • http://lycee-elm.org/userfiles/file/17885718155.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d799d9e9c---javebaz.pdf
    • http://hayatteknoloji.com/webimage/file/33814753989.pdf
    • http://juentai.com/userfiles/files/dirifawezaribegebeso.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qc50pg9la1skar2v7s03c2uljp/14280953847.pdf
    • http://hacoauto.vn/upload/files/nugewodaj.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f846a0fb---xepitirapu.pdf
    • http://sbnjl.com/userfiles/files/leneguwevuf.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/o4um9d4cld25n8hn4hlj766jd4/23656064714.pdf
    • https://heritagecambodiatravel.com/userfiles/file/98622298107.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3a.bin
0d574518e8bd52d14a9136b7fdd45cc74d76f7645ec3d1fa529b42cd7664d52b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10596 bytes
font_01_sfnt_off00010329.bin
8b9b5b3827c3266f766cd0f2e857ae417e4e2a22b7575e6f55fd8725a961ee90
pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 17064 bytes
font_02_sfnt_off00012f93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F93 16792 bytes