Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaffa01dc4e9283…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 08:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e902da91ca5187ea7b87fd201212a3ae SHA-1: 818ef756982b06846c9de5dd254a1bdbf758de8e SHA-256: 3aaffa01dc4e9283026cc54319c240f26a66c0246c82dd67fd8426dad3586c04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=enchantment+room+ideas
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a558115f3---neraritumilegopurir.pdf
    • http://ecohort.com/userfiles/files/41685017302.pdf
    • http://hoadon-dientu.net/images/files/pazod.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/88363825322.pdf
    • http://feg.vn/uploads/files/68182157008.pdf
    • https://5of7edwardstreet.com/assets/media/files/rasafowojusori.pdf
    • http://gediklimakinahidrolik.com/resimler/files/gopomawimamakaxofi.pdf
    • http://www.bash.cl/media/file/gerevaxopafifeseg.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0e053856966c31a3ae3284db7538ed24/24871940367.pdf
    • http://papierplus.pl/userfiles/file/71647033710.pdf
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/83260384846.pdf
    • https://ixiu-23.com/uploads/files/202109140015181051.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1b878oroo81rvg5ohekvd53stc/vevalesiz.pdf
    • http://ikkosushi.com/uploads/files/nekixodufijiki.pdf
    • http://biznesfishki.ru/files/userfiles/files/32581243792.pdf
    • http://xmzhj.com/UserFiles/file/kumiwafafepif.pdf
    • http://pevak.info/UserFiles/File/4087944004.pdf
    • https://isitekmuhendislik.com/userfiles/file/kiforiz.pdf
    • http://eakqshop.com/ckfinder/images_store/files/43274515700.pdf
    • http://namjapizza.com/app/webroot/files/54637517694.pdf
    • https://immobiliareincentro.it/allegati/file/ridolepobibawibej.pdf
    • http://autoklej.pl/app/webroot/media/files/9226516041.pdf
    • http://c-amc.com/upload/files/sefemofefujevonapapas.pdf
    • https://drddvichitra.com/userfiles/file/lutuge.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/lavejatexaxagor.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_off0000d9b0.bin
b4f6ed27ce1f64af8d1832db2788d4dd05a5430a66bda028a59024ad6516a73b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 10572 bytes
font_01_sfnt_off0000f19a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
font_02_sfnt_off000109ac.bin
c8b784ef2f4e95a828a58e1dd964ff8c80d346c9fb77b9c47ac029dbac9d8f19
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 17832 bytes