Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4d2d92a007fee2…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 10:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44beb03024fb2bf69bad4eb563e0e2d6 SHA-1: 521c0be2e762f8582b90f53c1e9633d0e7c3fade SHA-256: 8e4d2d92a007fee2044fb709e927b9cb7d3ec4122b3de6e5e55b3b462d66201a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of multiple PDF link farm heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb39b64c1---murojovesijibawabuxib.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/od6aujjn2efg07vu3meprugce1/towixiraganajojosu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209dd513fe---kipok.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1224f80cbd---difikobulubepebubelonebu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dab44bee3eb---57762541101.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/makatupuve.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/bowuvenodakaligal.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/66557278059.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/1475d542c186f020d573db4fcfc5c227/gudoderamut.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/51934327029.pdfIn PDF document text
    • http://safarang.com/basefile/files/40275187893.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uaqpiu9s8qe42noamj7nionh7l/dadonotetape.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/widililedave.pdfIn PDF document text
    • https://ayurmitra.com/files/file/87296212288.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/muwoxonofobafudatuduj.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/10535128052.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/d9l47fn2oocji01ngmg2bla822/8592138109.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zonaroxagatuvaxozaj.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/nivatavukop.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/lufoguk.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/rupabupobasot.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/86cf71b897b7662d05c831af758f913a/gilamurewufilaw.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be33e873483---jogasamufagamimik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+scarlet+ibis+reading+check+answersPDF 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_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 10812 bytes
SHA-256: 44565695daa87ac8fb0694567c82da322b70634daa1d4f8f8bf8de1dc936ee70
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 18512 bytes
SHA-256: cff7ef140c5daebdae23c49c126439718d722fd06d3faf59db01b66b9e4dc0ed

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