Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbe57f7c8427e78…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67c6e960c7274c4a25d2697ea216e3e2 SHA-1: f14e5f7ff72b4eb5746fb61c472c80be143b8a7c SHA-256: bcbe57f7c8427e78796a68ceacf66bbf7836fcc4581f8e9e10b55ac81939991c
164 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heathrowairporttaxi.website/userfiles/file/gigukanajibu.pdf In PDF document text
    • http://fornacedelia.it/userfiles/files/dadepegufabudawuze.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc628396fd---69606194467.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/58620286835.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/48952156265.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/26157867559.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/504c2c697a805c8d8c1336f9354f400d/bifakuf.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219141411202964.pdfIn PDF document text
    • http://a-pluset.com/userfiles/zakilemixa.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dexapegezo.pdfIn PDF document text
    • https://totounited.com/contents/files/buzugujifiliruramijemite.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hjl4i08a4277kvigdao3sqtvm2/70529747771.pdfIn PDF document text
    • http://dges.in/userfiles/file/rutimumaninobenen.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/91668595911.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/virulerazizalekigasawod.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/bapusumuwipopidomuxu.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/zexubudukepafapufe.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jowavat.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/fivekerupus.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/52243621479.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/321muntrjdmv2fdor9a0umpu9e/gepigapujeza.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe9998582---josebisiwusenikipowula.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/72729055867.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/kubakedifevevunobitibov.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/67906459192.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/sumavopunukepobedabuzit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gun+games+for+windows+10PDF 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 17580 bytes
SHA-256: a8e1b746268b16563b0533d601a78e8d9252491440e2107cb471a4ade2b3855e
font_01_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 10952 bytes
SHA-256: f198ef1ea89d6455e41b30c75de6f37083e82a3348affe0cf6d6cffc5721a96e
font_02_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1