Malicious PDF — malware analysis report

Static analysis result for SHA-256 846153ad2903fce8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 14:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc3f9ff2fdbb1a8c1b435e34cb9a1a1b SHA-1: 3846cd8838cb3d776aeb286aacf9d86f121b73ec SHA-256: 846153ad2903fce823d9c68a0d55a86fb8c66c7f80aa18e3e47417c689ebecfd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful websites.

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://catamma.ru/uplcv?utm_term=eos+m100+manual+focus PDF link annotation
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/54786017816.pdfIn PDF document text
    • http://derma-dts.de/files/file/9100695104.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/matibezagudafipatitavewaf.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15523bea9---godur.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c654b006ef---kitibobigoramusizow.pdfIn PDF document text
    • https://signika.pl/Upload/file/16793768717.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/54659443107.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/18429251264.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610be7839dec4---bijejorono.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/63996119160.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/93121824996.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/wogabupajifozar.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/45501729962.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0glfbok9btnctr60vssn491a5c/13680254342.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/22312312277.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/10043288077.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/78156947382.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/49672668377.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf15d0dc1ea---dipujisabozuzuzonujaje.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/e4d1sh1csjqkjj14arab935ibm/xubopiwelekifa.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/b4b75e26222f99272367d929f3c1fb03/gesabonanoluja.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/29894632354.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c4c32753---figiledibawezise.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/5036698193.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75511613162.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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 17268 bytes
SHA-256: 8ed2a11a20fbe16899faf93283d78487432733b5a2f5467c83d3bb8504c63c8b
font_01_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 10332 bytes
SHA-256: cdbdc7f2cecfef4473c2422b2cecb086ff1ce0bf965d32d021d94cd0fb5e76fa

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