Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f2a22164cb1fef…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 12:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ad50f1d2f331e09f06438d907c2c326 SHA-1: 7ce8dff7e9825ef0e29a2d33626010fae6bebbd8 SHA-256: f2f2a22164cb1fef0998ca6015a3209afa185e22bdd245bd5c6d437414057140
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://lawweb.info/mycms/admin/userfiles/file/rezekapuvijimekamarefak.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sjfs2ctjgs446uqq42c2u8k3jt/runitogodonuzijiketel.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/83968346868.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/51337372879.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7827a58ceeeaa44fee9e82d8c8366207/xexokufepekafuwowedej.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/63bd1cdc0af3f5ee574c43ed1b99f74a/86268164178.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/28564086145.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/penijusopepesimu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/jovofujejebipinavu.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/fevalelebuxibafapife.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/karefijagorup.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/21865756420.pdfIn PDF document text
    • http://c-amc.com/upload/files/13580397032.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/70622842267.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/31369980700.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/91700416307.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/5998938329.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/jitanugikumisesasoso.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cb1362fe6566b156885cbd77a358e68b/zowefegovuwuna.pdfIn PDF document text
    • http://kgmda.com/upload/files/jogezimulolipu.pdfIn PDF document text
    • http://fpole.ru/sadm_files/wewurolatawax.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/t3695gkl80eii46vlknts99pf0/88899662518.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/67436357760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=flame+tests+for+metals+lab+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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 10484 bytes
SHA-256: 2d8427175eeeeb73cab2ff273b93e89bb60093912f47213f12eed9c6726f3da7
font_01_sfnt_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 16328 bytes
SHA-256: bfbe4742d08fbba90373e324a31b1611ee4046fa6fd154875b20abd9f98f2ff0