Malicious PDF — malware analysis report

Static analysis result for SHA-256 929c1878c8ab642c…

MALICIOUS

PDF

84.6 KB Created: 2021-08-24 17:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70eda3e2e6fa96456899016beb941201 SHA-1: 4dc1e355091e0f4d8afa78d24f79ede90a13a4e5 SHA-256: 929c1878c8ab642ccf89ec5c4b09f8d9a829d3e9d927a68213296a55705ac2d8
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4489

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://abpaluso.com/upload/file/46042022819.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/420e3cc28d6acfc479c26ed3cf1977d2/jixafidadopinajowewibak.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jupelasevedisir.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf20c43e88---difovawazob.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/4079875279.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/44377820008.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/mht6o2gfe5udsvii9tuist5ur0/mujarinasipinosamuw.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0f2ffd485000a338a94e3a6855b20b8d/pajorebozizifanekopakoset.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd87bc1a1---namubis.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc46929f0f---tofopo.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/kamosujuwekux.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/jixegukovuluduxamajone.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/palajetul.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rowibesazolawapogewavibe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38d763700---91658338498.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e3bc4ba5---zarenugotopesaretotef.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e82ca2d1ee9---89655522393.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/27035560883.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608002287f3db---40889330799.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573e672c3d---58077910536.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/98566115768.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/62161715835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=different+types+of+electromagnetsPDF link annotation
    • 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_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 16720 bytes
SHA-256: d535d5bf7ba60b087f960d9cdc4704ba9cd9916360c1ff81436978c15fefaaf3
font_02_sfnt_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 10940 bytes
SHA-256: 338751e10c0ffc841ec5f0af38d6651817163fb25a9ed99093c9bd708b29a9e7