Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4315fe93a4e82f…

MALICIOUS

PDF

75.4 KB Created: 2021-06-30 01:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0db30290af86d97b7e3903ef1181edd8 SHA-1: f57c03a59be9199ee0774b95c48b1302258a05e2 SHA-256: 7b4315fe93a4e82f170c842d600a4e828cae0145c0ee0c0445f0760ce6a37243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are on disposable hosting, likely to evade detection and distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/83ff08e145b109aaf9c7e4397602a1ab/98971584324.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/47b247657373d060724024f52467df86/70038828603.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9f40c648---47551425244.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd30657ccb---97357189765.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a723e6831e---vexapemamakomutakumutes.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8c2f4903562eb2947f2f2d5af4351346/texurufa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be97a86449d---vifugebeguvones.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gusamugopa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d587813d---jijefoworixe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d0afcc3573b0ecc662a54e5acaf8999f/vufunavevufadewejod.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e8fbd2439b115e407e414a8343f6c0d7/8395102803.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c5b0e82bacab838c8272c4a2fbe63f24/libijawibivise.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f53387c439e57f24592b0b4cf273ee9f/kawuweraxuvubatavi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/todiremanuxewujix.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b6a5a71f6b5692dbbf2a15d7ab528481/43332538145.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c735728b16102bc4a01d04a36f3e82cd/48743959792.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/woberusijojo.pdfIn PDF document text
    • https://iwistw.com/upload/files/79340415738.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qfo5k41rv5rven0kusp9nismml/37031938780.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b06c023e7---361801845.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae36f3ce8---21890507894.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/pefonafopokejene.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b946f271e9f612d995e29cc2c4641c09/pulobujuxusomigipa.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b8b70d2dc7270a3bd734890e38883711/47719325520.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdb4bbeb9---lerijeruwebivatanutiz.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c688adb05c8---xesoka.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qvvv9b857uno8dinbif7abm0gh/53586510568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=70+wapping+wallPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000c446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC446 17524 bytes
SHA-256: ec9603fa3832ea58a34aabe9912cd264831d30c988f9886ab56364b469fcbdf0
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 9968 bytes
SHA-256: 56ed55733fa2672e74c46823570d76e52faabc09db1cf6399acca5288e1fc45c