Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ee0bfc004f8aa…

MALICIOUS

PDF

64.0 KB Created: 2021-09-01 05:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0db306773ee1c8d8041aa63794ee98d SHA-1: c122098dff2cbe6f0bc95c54e68eb1bd4ebba869 SHA-256: 991ee0bfc004f8aa59b0484fc8e46fbf5bed687c37b8207f15812fea3f662905
154 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a phishing or redirection attempt. The presence of PDF link farm heuristics suggests the document's primary purpose is to direct users to these external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6481b1a861fb86fc304038d77a0bc624/lolofuweruv.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce758b64efa---ramerukenikomix.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/7805985621.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e5a1d7c1b5107d0eca51501453421b7b/xuvodikagawisenawuzijabu.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/fujoxogolalu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/tejowomifusovibizal.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/47186235130.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435a63cdbb---56929088599.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/wobukumas.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/38634427060.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/83268992298.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9367e838---davumomipokutalekarumizi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/93dee5519a63275b093f3e7cb1217733/13248576588.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4043cd34c0---biwerofusowamexuzoj.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f338e0836e125c7eed0758300e6d5075/nifisaxulonidodufutil.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/80729699657.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7q10q2lf70f3fgbudteino17pn/beruwopoj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a414f4ceefc---vofavuvapefuvezepuloge.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/jaduxitokixuni.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50f379e87---zavupuf.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba777d8cf93---51416071955.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/mefuxagodeve.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/162220553902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=causes+of+hypercalcaemiaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 10788 bytes
SHA-256: 233ccf18cfeb532851916139562bb921db9118fa5d16b8319e56fe9316e70388