Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e38dbec8ee7cc3…

MALICIOUS

PDF

74.6 KB Created: 2021-06-26 12:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67297fc73899d89ab7eca6b0601201ef SHA-1: 7210d1410cc03fd9ff4bca91db21efa28ec6e995 SHA-256: b1e38dbec8ee7cc3288d34503d06b3360ca6cf1de26f66824f0b6c659756a69d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=how+long+is+6+yards+of+fabric
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c29255c517e---rorubogak.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75c3694---wiminifibubonakesusufi.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45712b9f1---jototowasirojusepadufawog.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6418dfd87f228256975d3bafd66d49c0/bomamolaperina.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/06c9ad3997706adaa1dc04f042472037/98510365082.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af37234a0e0---butabuxebodok.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072542ee1b12---53270874040.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/panijamusikagewunukupamu.pdf
    • https://travelsafeway.com/userfiles/file/11708480512.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a63e2d0a---30916507350.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593813027a---39353345963.pdf
    • http://dallapietamarchisio.it/userfiles/files/31154873823.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086efab05f75---18639660347.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608415a13db1c---46735541180.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/af7866rer1jq9kjdsmq4tjg3f3/83934701760.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8f298097---75294278360.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/39776329368.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160778d2c2779c---tegajadusapopam.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/mazitaponopigilezelewasob.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d9547d05---45739828989.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3f22276a---wetojaxopevapejuk.pdf
    • https://sfeerweter.nl/userfiles/files/61365117338.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/6193771826.pdf
    • https://wendi101.com/userfiles/file/lobudiwonidubup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c346.bin
95fec0fe9ff0685566071bb11a40f39eaf696439967bfb11450dc7ca34371907
pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 15700 bytes
font_01_sfnt_off0000ebb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16792 bytes
font_02_sfnt_off000103cf.bin
ad4acf6e242d653c07419c2eb9ae0e06b4bb9bd77015b3af2a4f516ee4f558b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10920 bytes