Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1be8cd3458d8ea…

MALICIOUS

PDF

82.5 KB Created: 2021-07-08 08:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba30c171714dde3f31c6188b8a8adb41 SHA-1: be0a777f5c6213b10efa295b2feacfa711257ea9 SHA-256: 2c1be8cd3458d8ea9bb8ce95e66d369df278a99a3c67a49da9a3fe6cfdf46201
124 Risk Score

Malware Insights

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

The PDF file contains a significant number of links pointing to compromised WordPress upload directories and other disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4749

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 https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ba31612f7f35ffcccabaa1f65448f203/38458926995.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb0b4a88cb---zawarokozeraz.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a2fac73d9a0313262f9929d06fe98efa/tomisepibumulenuputex.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/6ds3d3r5k232p9cc6o1vqh1048/favajaxexopi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3333608f3---jizekikalelolutagokuj.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/pinag.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/mipubexozevaxugagup.pdfIn PDF document text
    • http://emeat.ru/var/files/sisatulusurinanid.pdfIn PDF document text
    • https://led7.ru/file/85920281266.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083623c288f2---10454607203.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905962ea240---23583235302.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/rikera.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/teruridakovexexufu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4ff50eja89p07s48c655gpe7o0/80195550245.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7f74ceca---23593693051.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d2c111dafe7c1420b4ba26579a97ba5d/26767413738.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d23009bb---nubamiromivev.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/267236b786391ef0adbf23873e92028c/29372118583.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdcc9bb297---widunubiriwa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ed647639fc026a774bba0c9d87bdf2ad/28969953020.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bin18v2gfjtqddndgv48119c8q/9282564947.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6e852d55f0be7b128469fe409a813a18/1412699637.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/88452209183.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/zifavezila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+government+bondsPDF 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_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 10652 bytes
SHA-256: 716b3e975bdd4a1715c3adbc31658e30a279d3a05e85d6a5241268b571a02cc6
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 21396 bytes
SHA-256: 2493fbfeee834b133823a6872b465d3f8ef9ec1962138c12e7a33f604e2063ff