Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf91e451b2029be…

MALICIOUS

PDF

84.2 KB Created: 2021-10-07 13:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a7606d89b2e9d5a851a16fac619f4a4 SHA-1: 2bad9f61e84ae4ee7cab5c548b2c7793e7bf6229 SHA-256: fbf91e451b2029be63dbd37ea5287027350f3dda70e40565ee97e1d2b69b966d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, designed to redirect users. The primary purpose appears to be to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nwatchonline.com/userfiles/file/zavozefunipud.pdf In PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/nuxiwufusidavunomotudema.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/85748929405.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/77834065542.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/likejutomazimewukuvin.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-10-1/20211001041109327019.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77f467ac0c707c351e8b11f760806acb/vuromubapezut.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/39763314751.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/furexavazeborudo.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/nizabi.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/regaseme.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/27246794881.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/wovul.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/84619159648.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7d36fb14---wazulagowaso.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/9071874185.pdfIn PDF document text
    • http://aven.su/userfiles/file/17998837900.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c97fea308---41538847975.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kesev.pdfIn PDF document text
    • https://selispin.net/calisma2/files/uploads/wewiludugu.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/begeno.pdfIn PDF document text
    • http://www.ezmoving.com/file/gevatisuwobubexan.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/88118711288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+ultimate+javascript+mastery+series+mosh+download+freePDF link annotation
    • 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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 22552 bytes
SHA-256: cf95039dcf5dfb8186b9478ea912aa1e28f53b3cccc816794aba2e2f11871adf
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 11344 bytes
SHA-256: fcf791a0c8d90ff35df585d05164b8588b57ec46a50fced367d0d2ead393fe20

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