Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec8ba17945ff74c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-22 09:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2ce5a6ff048b13393be20094bca2875 SHA-1: 34b88b3a685e89c496b3bcb1c274f834cf04caa1 SHA-256: 2ec8ba17945ff74cdfb441d93d24f454f5e6dcf9706b2d194847f36b16f07c49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

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 http://gfzgt.ch/upload/file/64504260600.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16149759ec18d5---kixekogukusile.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/napujorurupegurirotijup.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149fc1f54bbe---zuvujuwame.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/vodolikulowazetolevemuj.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jibugonefapanusajogixub.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/lozelesitavuruvolazawawe.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/bavinomot.pdfIn PDF document text
    • http://cpviettin.com/upload/files/maludupupobepupif.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613718b53377a---20244675770.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/latixewojixumigoxobatuj.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xojikatidupuvoxakos.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/nujikifexurazubag.pdfIn PDF document text
    • https://sopkambing.com/contents/files/xufawovovorevifazop.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c9ad2b7---68760776414.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zivuvilumovugojuxemuxad.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/aeac019adab79126846057449dfcc12a/sisumubusi.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/budini.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/repelaben.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/lekixufigoju.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/11428222450.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/10504131845.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/11882770830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+1.5+cupcake+downloadPDF 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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 10752 bytes
SHA-256: afddc89f3547fcdf8d88782e429793df024fa3c4b7bdd80deb7d5dcf89deadf2
font_01_sfnt_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 14368 bytes
SHA-256: fb4deddb37d0ab5706d4291a046652a6df700d8944588a738a989d4332e543dc
font_02_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1