Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc57895a893b6f61…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 11:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b415049120f766fa8fea0be3b4168a29 SHA-1: 355f79f1feca8f64046f83f0709ceae3af2e397b SHA-256: dc57895a893b6f61ec504c448f93b8d26a542c159751660b60109ef7e1142b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, with at least one hosted on a compromised WordPress site, suggesting an attempt to distribute malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ontogepszerviz.hu/editor_up/biberozugu.pdf In PDF document text
    • http://keramann.ru/uploads/files/siwupajesojamepuzu.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/77438866876.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/7937084720.pdfIn PDF document text
    • http://scsychem.com/upload/files/85030442039.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/rodoxitasekodurosizowob.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/ganidetoku.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/69440569292.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/sebixarolonodorewixev.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ljk5dvirijkm7re066var30eln/fabopevo.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/jadetutikorurexozelen.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/92281409306.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/12224843505.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/5594527275.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/zuwusapafejaxu.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/mokeburazidatejuzas.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/2f5pi3458pq2nueckqgq34371kr6poi0/zevuputejulas.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/66269205087.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210911182251.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/19350374570.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/20508614247.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zaxolelegaw.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459eff60e9e---88689228499.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/tekefutika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+totok+for+androidPDF 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_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 10228 bytes
SHA-256: 774b0ee7013385f13d501df5d67ce2165297369f63384ca0f5a43907c0f27a29
font_01_sfnt_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 15180 bytes
SHA-256: b25d234c50a797f1f0823ba092eaee28606df0dcd0c938ff6c2ba555b4283741
font_02_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1