Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9ef3a4bf5b3820…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 14:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54722a920151fe6b8c1fc714901dd137 SHA-1: 84bb07bbf6c0d02c5a2b0d4a09ddb85e10bbc290 SHA-256: 9d9ef3a4bf5b38200e32fac04740c010add161ac94fc1ea149d787307a3300c8
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a pattern to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://captaincook.hu/userfiles/file/lamosemefibasifoxa.pdf In PDF document text
    • http://aryajob.com/user_upload/file/bujaloveduwixuloganapab.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613953eb54270---49899844215.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161423b1283de4---ridodavor.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/mulogibawazavonedozexoj.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/dafupuvoduzufefulirol.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/305220597.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pugiwemaganetigazagosuj.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/5248466989.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bekofufavototodun.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/14278459962.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2090a2ce8---72992045315.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/62980452505.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/kijusepanosojukavobizifi.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/66307498347.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021602_27501437.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/82342393527.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/46203478846.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/24715052542.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/28063838570.pdfIn PDF document text
    • http://markone-tools.com/upload/files/mubika.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/gamegebitibubutuzamoxine.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/28698061098.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7817f8e67416a04e0fc3a7bdf3acd7fb/3558241256.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/kumefibevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fortnite+battle+royale+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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 19604 bytes
SHA-256: 66d13ef95e0bd028fe9696476a8ee0b17c6453a2e0924d578dfa3a66940bf92d
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 10304 bytes
SHA-256: 119c3281eaaa3b2307ca18253f684bd125c2411d73a79a32be906d54d1a82b97
font_02_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1