Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74e9b18e1b4ff3d…

MALICIOUS

PDF

71.9 KB Created: 2021-08-29 07:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 138c4275a7954e4f1c84fae3b20e517c SHA-1: 886f45c8d812d91b01adb562a1fae83ea2ada817 SHA-256: e74e9b18e1b4ff3d133104b34058ca3939271a0340f40dd70adbb9ccae6d5611
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable hosting, suggesting it's designed to lure users to malicious sites. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://schodylux.pl/userfiles/file/kevexefuweji.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/masupomafajubij.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/19445538913.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4c15f80847fba0603b1961b45dee50c2/zilorez.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/wirak.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/poveboruvezeweko.pdfIn PDF document text
    • http://hak-al.com/resimler/files/41693636828.pdfIn PDF document text
    • https://filetorme.com/upload/files/79693090617.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079e30b0350c---50634001315.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ec1ef81d---dopotokitoxigidix.pdfIn PDF document text
    • http://workontext.ru/media/file/92461287391.pdfIn PDF document text
    • https://bfull.ru/uploads/files/8940440448.pdfIn PDF document text
    • https://kristinanamaste.eu/files/vuxawitekekejeketatakoni.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120219bacde0---20718552495.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/90433292285.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/lc23fe9vj61icvbdqeqov9cs1g/79772214729.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/19827745958.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/59930726938.pdfIn PDF document text
    • http://fxmeat.com/upload/file/eb8619016a03486c13c74b0e95799fa1.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/biteredo.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/vewixiguwa.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/rezuvobadenoxaxesumuw.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vivina.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/negaxaranipuv.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/72087812036.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/78973122884.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/38371299456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=i+had+a+dream+that+i+could+fly+from+the+highest+swing+lyricsPDF 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_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 11172 bytes
SHA-256: a4dee331aaaeed2e817ece6a20703cc5e70f9ca2f1dde664366b7c1bab8c3321
font_02_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 14628 bytes
SHA-256: 7060d49ed094abc3b4e3653ca16d87fe40ce74adf3527d22244e9b7a7ba38f14