Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abcef3fc05e26ac…

MALICIOUS

PDF

83.2 KB Created: 2021-07-14 10:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3da4b389359beaaccb4d0076c58fba02 SHA-1: 91b469d59c8344f721f8a8cbda7b4c98e4a82f98 SHA-256: 0abcef3fc05e26ac49827c7177095ebea2ce24bf9fa7c05f40a9c199c7aa658c
124 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing sites, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4864

Heuristics 5

  • 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
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922662e9c2---98070942750.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/dc817f3a54fd0c18bdf2f58fe93e6cf7/noxanujogolukoredokawexo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/jexelimomipuloriwidefaw.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9dd036a7---nufuduvoxupo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878fa31edc---84745741018.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/surekabazuna.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zewababekejale.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suss90pt7it48g52b31jimn7cl/jepoxipazogoma.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/65747331415.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608243832e25a---90356205833.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1886e2b57---26139503112.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/buxelur.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/jng569cce7eeeef4nninq6grt1/rusumuwowefajowizowomomiv.pdfIn PDF document text
    • http://texmet.pl/userimages/file/5106738832.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/5033892047.pdfIn PDF document text
    • https://memoservicesrl.it/file/saketinotapibejoxarap.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/bigufiwezituliwafozifig.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7412331a84---mukejonofawunolujipakagi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/71127518052.pdfIn PDF document text
    • http://headrepublic.pl/images/files/35538011937.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/24878257780.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lelolopomewomesuzo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3eed5703---kaxafuvejojesovav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+me+before+youPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce694512d70---81959921755.pdfIn 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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 17204 bytes
SHA-256: 63c20ff451d13b0c2a6f8ba43b6b9bb3fe826e45afc06bfab106101142c5651a
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 10128 bytes
SHA-256: 9b62f0448dba80c72ca4ad6583ad69013d2f3a995b0ba28a24ed16562b85128d