Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ae7556f49d9368…

MALICIOUS

PDF

79.4 KB Created: 2021-07-19 07:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71ccd958df311c9572df4e3f754e93cd SHA-1: d16ce3efc83342033ecf5f26f2e3a301a288eaf6 SHA-256: 72ae7556f49d9368981b73dcf59cd3c6ab83206c0402f2d140536dd7475aa7c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious. It employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is part of a link farm designed to redirect users to potentially compromised sites, likely to host the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd039e8c67---toginoxozibegefebusujivi.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a48512ddb---17473870016.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qehlitunfm6vsbdsjhktffl0q2/tikukuvegumekatuv.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xomatukibopodu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/gesijevuramebugibom.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vovubija.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac13601d34---34005086087.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/lamimominexujurazolokuxix.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2fcd6bf5---pidibaxipunawuz.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/55220212690.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefbcb0e37---58928326274.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/zudapimuf.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xesonu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/vowulelo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/48155183925.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gerakedasimomorukut.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/98cf73f584b32abac31a91d78d5d447f/tebulunonupogut.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9b71af8ab2a44bae3d1a83acf412d117/40908053881.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///77160950523.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2fcbe4b3---36570431380.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/202033241601.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ca2a8366---50015730207.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a1nkel51qgb7fte6nriisn0sgr/marutajovokufadorisorota.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/jalevuwupo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kegiwalanowebusemoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=plural+possessive+of+mousePDF 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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 16716 bytes
SHA-256: 3c0548b2374c70c1bb07a0f2e4b7090337815538ffbe20e1f3204098d3fbdbeb
font_02_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 10484 bytes
SHA-256: 537c06d4424743cde2470b1e48ac89858186d83eff52dc89fe1375167ed94d0c

Open this report in the interactive analyzer, or submit your own file for analysis.