Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6df66c0f932d013…

MALICIOUS

PDF

90.1 KB Created: 2021-07-23 20:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9bb4779d2d0af3249f11c051cff1719 SHA-1: 356ff00535f0dde75bb90b1d51638e22d3fc0383 SHA-256: f6df66c0f932d0134d0a4b2463ba0da59d95f67eb5809107a12290f23b46bb1d
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting it's designed as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0177c6c7f21665f48b9264c8d83b0891/vusorunovewijabuvuxo.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d787b8b4e5---29826233254.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/aa8ce5b6233afd5ec312bdf742bdf35b/fipopokinaveko.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/jejopoxelatut.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/kogalodevovenu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e0e33c711fefd2c368e6c4d61f884fd2/suvimutumenu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/f9h3uu527a3t5cavrq1soapksg/69610653354.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/90966827051.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/57575650231.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47acc0cc89e0b4a9ba5299c275be4e9f/jilivobipadofikowux.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f71c0f56---5590935386.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/aee59df8f26c730d616ac514759096d8/sivikorixixupixabi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/42cfe530b31be0b44619afec168dfd95/mutidaf.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/furbgfnap7nu6usntk65q39s44/4533928056.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/balokola.pdfIn PDF document text
    • https://tigapilar.com/upload/files/kituwaziv.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/39427419601.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fae12e864---jivufuwanagalatevo.pdfIn PDF document text
    • https://silga.ca/userfiles/file/dikomafojivina.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4674c61cf9---62529465388.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23054e0074---vipefuro.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1afe498c60---29650332436.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/nudumezatefa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5242239c9cdd4f4e571c41e5faef0260/71111769632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=can+i+use+a+waterpik+to+get+rid+of+tonsil+stonesPDF 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_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 17316 bytes
SHA-256: 1bd607b12183099aa2bc6a8e515ea2ed51488373171808d4594f816aca5477c2