Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fc55a7062a02c2…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 00:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 115abfff21d2f5073688e501dc387e90 SHA-1: 5b1318b9f7cd9fb46bff8e790c9c3665bdbad75c SHA-256: 57fc55a7062a02c2eecbf3aaa3dcdcd30d459125385673ca11f68409335c6298
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded links, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdadcf23c1---mosakezuripuzofetezoji.pdf In PDF document text
    • https://cabsfromheathrow.com/userfiles/file/67990964861.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zuzamunilubamibawub.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/de9a62462696058fa7a37bf8517df81c/wuragokolefudimumat.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b913ccf975114bd199dba9ef27b31f1c/katefogul.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35ac55345---jutexesipepovedituk.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/65448210903.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abea53bacd9---pewasimepatenavawiv.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jhfeu4m1vo0d6fkgbkp48292g5/zigig.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/temezamosakefupuzusezixid.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f88a76756---veponomod.pdfIn PDF document text
    • http://medi-sen.com/files/files/12267249700.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/80848179205.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/8097rdfdh24cnee9o74vs55kgh/59416546791.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dsejtq11vhgcjf98ja4i8tpaen/puribebopubele.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/bejot.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4a181df8---50225237018.pdfIn PDF document text
    • http://apvn.info/userfiles/file/tamalubuxejefajer.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/malebezogawuk.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607efba8451e0---fanerafixinomu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/datufiri.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/28137956883.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732ebd0b5eb---biniwivedur.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4d474e850a4ef863ac5eba0ffff7a0af/wopiziwijitobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=degradable+and+non+biodegradable+wastePDF 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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 17340 bytes
SHA-256: 76552219b740c2a9252491a3271cc0cbb0f1cd52dd64d871564af9abac563208
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10652 bytes
SHA-256: 47947a2f96d8f72874ebe7e39d28c3b5c4728e045ad5da5efc52e17eab67a31f
font_02_sfnt_off0001344f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1