Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4283b0fd2a62879…

MALICIOUS

PDF

90.6 KB Created: 2021-08-05 03:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adf4e8ee4b410c39439da0094d291125 SHA-1: 0fb5cc4dce4d4c921179f0ab778d340c499777ae SHA-256: b4283b0fd2a6287923782f11c256cc42cf20fc33a91e7efb448bbfcec5d34c9a
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 revealed multiple heuristics indicating the PDF is a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=cheat+gta+darah+tak+terbatas+ps2', suggest a lure to potentially malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3961

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://coretry.ru/uplcv?utm_term=cheat+gta+darah+tak+terbatas+ps2 PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b474c4d2dd62d43ec05cae310b777863/72974182370.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/waneguwazifutalub.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/pejaluzana.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/60482769367.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8fc8e4b2---jovalagu.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/gebomonuke.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lovenamida.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gelekozizigomemazojuj.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/mukidiwulobisepakanimoti.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/96541232458.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/65109729312.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f689b2e4ba---87025123287.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/36457952207.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202156223414016.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/60346895075.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/91702145205.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5hh8v0e7f12a0sov39pld6l81u/tosiwifezo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/uu1drc6bqp480q147co10aaqjv/62994574700.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da51e54d87---fepexaditumiki.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/fegepirazemisexizo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/gke9q04eg39d5ubek49uehf766/mumegaxazinajik.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/57773679023.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/44821560905.pdfIn PDF document text
    • 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_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 10692 bytes
SHA-256: 029a0e658752f5a534d36578a84608d11c81ba52a994e36b815bf6bac4c3a4bc

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