Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bb31e32981b6aa…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 08:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e16878e8a2233430a16e1b0e2b36d194 SHA-1: b5f0083bb85c0e6b5bd24108c3fbca83c98c3ce4 SHA-256: a5bb31e32981b6aa6ef8c0b41f714c744863e221bcd0a60ded7ebf88d12f90e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely designed to lead users to phishing sites or download further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

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://allytemp.ru/uplcv?utm_term=how+do+i+enable+sms+on+my+android PDF link annotation
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/visaromeboxutepudojo.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/fidatoruwofo.pdfIn PDF document text
    • http://traviet36.com/upload/files/jizag.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/6495880810.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/vemutavetalovim.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/wuxidapenaxoxabodafabim.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/peluvamolonijij.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/16917382890.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210913203132.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/51856063233.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8234873195dfc634dfee1837d1c449ba/bagujerebaxefuxineduzu.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/76720584631.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/78668627614.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614795571822a---gavib.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405776279b2---27546882025.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/89964993387.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/43720984700.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/birupupofulumogeroratoj.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_C14997AFB184CEE8.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pikaluwoloz.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-7/20210907181950735364.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/29366189182.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a24d28b88c7747c474dc8e0707c4dd97/23219635855.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/24917424730.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/84833761360.pdfIn PDF document text
    • 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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 10644 bytes
SHA-256: 7763be2085625977b65e8d14c2b85d51b170327c88ee59bdc95b3ce7d3574aa8
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 17476 bytes
SHA-256: 845d0326a9e7b1d9d2ae9582a3ed3e8683608db2bc5ff318d92558095fc793da
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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