Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ec5bff1655f8dc…

MALICIOUS

PDF

143.6 KB Created: 2021-07-18 20:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 190adfbe76f82fdbb532bfea57070e52 SHA-1: ec2fbdf85d8bc4351f44f187f2f56f387fc4ec46 SHA-256: 31ec5bff1655f8dc4d04b661085c763166d1c3155d44b7b35f90d68e1bd561f1
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links are likely intended to lure users to malicious sites, aligning with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4835

Heuristics 5

  • 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
  • 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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a024744ff1---51856646065.pdf In PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/37987835113.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/56382601067.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086359b13e50---fivovitufudasus.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fd72229704d86219d31b391506b6d0a6/58825392535.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0d68307fd2b5f56a4fc822e9a0e5a144/rikuvovegagezizegolilim.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/57130865947.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4quf7ju63pf27vcqss3hfo0vu/67341191514.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gihlrkr11s6mp9qpspntatjfp7/73529501302.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc0d31659b---xugexivilarivopugepigu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/499iclqs06rv6o0k34blpdtcd5/20997796809.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e159539ac94---29527452597.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3c1425b8a11ef55a71a932ad863fc77d/detirafesowisuvo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kivkmsijq154lk8nmg0igie9v1/meleseti.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a31cdaa8---buturubidapukubafeke.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/12a9dfb16dd9315a19b1371582cab5a6/14404676916.pdfIn PDF document text
    • http://imaginove.eu/data/Files/51591255742.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/21d8ff7e03638f4714b98b056a6b13cd/zuvavusujatu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775521e4f6c---96328834274.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be520bc9ffd---92753359490.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fda2ff7284667651a4cb6748c2a72ba6/wimozajalojodozazasoda.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/vurirowezunifefeximerito.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/oosc26o5vvt7prrpcglb2586e1/kubirivemif.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1d843bfba4362e9e605da9ccf3c0c352/85575293476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=99+sheep+1+lost+bible+versePDF link annotation

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