Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ab3eccef232009…

MALICIOUS

PDF

95.4 KB Created: 2021-07-29 18:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff9702558397f0812bafee53fc1e35a7 SHA-1: e7e3008dd5f3a969e430e0a677aaea56889f8785 SHA-256: f2ab3eccef23200970ea520b57c7663b9d6762fbf06135e03bb33c6019bd19ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5bf6155ef5702f568045aa75a0aae177/74220967042.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098930d8161c---benokenarodawadugedonibud.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a8a62f10507728b578006c2b3c86d3b3/42497711206.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vevogopusufofazugexa.pdfIn PDF document text
    • http://planetamama.ru/files/file/82176607425.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zomuzubafiwatewowa.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/xurinonigisarajolupof.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/92851539932.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/65744578493.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5bb0d896---jajefivesofapapuwu.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zubotepefonexazineg.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/23008746704.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/48571353253.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/kudewogisoma.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffaa78f37---kodetexokutifewomojina.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4c217099405b2b07422145cba188908e/19334310629.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432f5b3a09---nunetutekewulamo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/504ced6f996d3738e89812bb53d68db8/36186960629.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/lobupepedizagirumitugawuj.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d6ca62789---gutudon.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160814caed2942---domizewu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e6f2e8685---34639431607.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/katifofegidixabaxuselo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5da61be757bb8b47941b7c04256308e6/69448724855.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/mubepipobodu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bewijobesopapapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+command+blocks+to+teleport+in+minecraft+javaPDF 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_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 11384 bytes
SHA-256: 0000eacb34bbc7c3b7b91d47d81d7c9f5cb5ebc5640ccbc72a65262679fad40c
font_01_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 17892 bytes
SHA-256: a2ad27e00e9ce5640e5099075f9ea7631d79ea9d9c00eb3b2c8e26e75ceae9a9
font_02_sfnt_off0001571d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1