Malicious PDF — malware analysis report

Static analysis result for SHA-256 e840340f04475ed5…

MALICIOUS

PDF

131.1 KB Created: 2021-09-04 16:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4d0d23f67b7801e74092d81c2bf3b6b SHA-1: 9e06cc1391f6123511e8787b477a7ece94174ad0 SHA-256: e840340f04475ed5a8b9b66c6713d1a6e13511d6ef26a517d3552f419e140813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=triste+bahia+sele%C3%A7%C3%A3o+de+poemas+de+greg%C3%B3rio+de+matos+pdf PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fe9c08b9649b432a1a22d0f407a61f40/22344947562.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/zibemivixasugesixotiba.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/60323335945.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/5021533079.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/figepetu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7cniu17df1no0spkkcbdadr6po/nepajofisekezo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/91414643059.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084b6570af---21431876851.pdfIn PDF document text
    • https://area5srl.it/file/voxowafanokopujisoxaposom.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/es9truq3662b4jut54uvme27k6/xopunon.pdfIn PDF document text
    • http://demkapi.com/resimler/files/vifijiwovevazezefobin.pdfIn PDF document text
    • http://eksternest.be/images/file/96438300219.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/wobereg.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6a30c63---puladinetupewe.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/23236814415.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/fadiduputugimarug.pdfIn PDF document text
    • http://samtekelektrik.com/files/merozejipiluvego.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/77475484731.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1cf64c5bb8c5130379a27a9a4d6d3838/53984533093.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/au0o3d6nhkhk5abpsrvuqk74c0/xuwidifofatup.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/2155295960.pdfIn PDF document text
    • 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_off00018f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F0F 23388 bytes
SHA-256: eea9bb3f9df20a2e5154b490f98a78a1ccd91d6734e99ae66759281c765ec675
font_01_sfnt_off0001c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E12D 11544 bytes
SHA-256: f25f61e48b5467fd196336b2cae1681870cdfb683b8961db156f6ee025babda7