Malicious PDF — malware analysis report

Static analysis result for SHA-256 de54404110a28f06…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 23:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75636dac1ae3d59ba3ffdc7a14c56cc1 SHA-1: 9bd340975d3fda9172a84050192085c34b43056c SHA-256: de54404110a28f06011db5b6235bd5e078c2b54f3729c2536a490fab7c2abc3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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
  • 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://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/69065269278.pdf In PDF document text
    • http://cdmvt.cz/sites/default/files/varegida.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/wexapudoderi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079296ae7da9---46576964592.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537501498e---81872984347.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0b741766c30db4ac14e91f5a1978557e/musasigituzi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e91b7706c3---forewemamosekikip.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9eglstdtdm6grobrbf54cgq0ob/gijaniwononegeji.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/6961808597.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0c9e712da3cf0d9fdbd667f88ecbc4fd/pobobajiduzodesak.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c549306dc6a---32982662143.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/580089cb9bd178e13079aa1f83804b9e/59682485562.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fbebe0d80---kudevikenoxubupuwax.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/91d8fe5d652033e9d4caf5d0fef3924e/wiwedafazibe.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ac699483---vobaxitipusane.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ca3f6b9c395b9bb4e472a956abc44118/48101671560.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73099eb6c---vubipegugi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7ba3f244---zukojuxemed.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lukomakuxunajidafun.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dd787a77---69530677976.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/33691268284.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/v9jvkgo4bdpq6a3u012c688on5/tofubunikibixuwew.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a563cf1f5bda233ddbcda1f19005e555/55623583684.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f7781faf4964827582a28260488aebd1/tepesorikagogefutaxu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qf81dg0e08cv4cn5g4tfag43p4/58072545556.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4orlhpil8s2sbhluhbjbmnigs0/16928165498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+often+to+jelq+for+best+resultsPDF 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_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16032 bytes
SHA-256: d77ffc5b37b2d81ce2133a47d52cbabc72c77c735094bb8f38aad8a70d01b341
font_01_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 10548 bytes
SHA-256: 2f74b22d04e7e2b7ea357d1d1341017adc2775feeca98ae1127c597012cfeeb9
font_02_sfnt_off00012d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1