Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e24a41841f172d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-04 11:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4371528956cd764f6b411332fec6dde8 SHA-1: 2edbcd7612eeacc1587bdcf70896b010c227e320 SHA-256: a1e24a41841f172d52589878c042288c1476e020f2951889ce8d8e11cac4692f
124 Risk Score

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to files hosted on compromised WordPress upload directories. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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 https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5831b2c1e4---tijebilofozusuboti.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4d15a744---vasidaxekido.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/20974710414.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/97365946438.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/xiwisitukinidukedupawowaw.pdfIn PDF document text
    • http://balone.net/_upload/file///luwegomixosipev.pdfIn PDF document text
    • http://garderoba.sk/images/_file/88908359236.pdfIn PDF document text
    • http://seamacros.com/upload/file/1502206233.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/wazokazurigo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49593600105.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v6j81g9amth8aar8315cbnh74u/55297825023.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/78491677906.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e83d1d7fd92e3cefe67bc5357724119a/30415408.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/56970553226.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/41360021108.pdfIn PDF document text
    • https://medtek.vn/storage/file/75466340976.pdfIn PDF document text
    • http://remobudostol.pl/pliki/88637781663.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/29835b51bf76fd6fe508d519a21c8cf8/92648211719.pdfIn PDF document text
    • http://unityproductions.com/upload/files/96680382080.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kixaziwasejefibedobaduzu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/28282045872.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0v01gm34anq3uj9hbvfephu4o8/22644745264.pdfIn PDF document text
    • http://imi.vc/upload/files/gilemadejo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f18a331d9f3---64083051751.pdfIn PDF document text
    • http://klinok-saintp.ru/files/zixeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=echographie+doppler+pdfPDF 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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 10512 bytes
SHA-256: e414afab31c0a63b13d3bae30a8f072c08e36ba1e488d775b589e23618dfc381
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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