Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef270334dea19be…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 02:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d54f993d2dce1d173688b64a0170efb SHA-1: 944c6c2faa8200e73ee0f93efd0225166cbe5234 SHA-256: aef270334dea19be3dd20286deabf3f78965480ed4e619c3fae02405325c51c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall detection profile strongly suggest a malicious intent, possibly related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=pedometer+app+free+for+android PDF link annotation
    • http://eszixv.hu/ckfinder/userfiles/files/85484887841.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zusubexulivafotedijutaf.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9f95f6b482a0bd2d6ea8e5e2e900c58d/2461035433.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4d3u8i4qru8krh3iq1a7tleec5/sivisolag.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/vorimanebigag.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210914_19_50_43.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/b59sg7mtgl0psl5841idbj70rd/62553748732.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/78803350749.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109102203196138.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/68097633549.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/gisejovumu.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/23607768758.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/38584597640.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/69437406796.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/xawamaledit.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/rowotegerazudumufa.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/gofijetogidejipejaw.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/zururorabegix.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/jaborazizi.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/dilebogusewobos.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/73998446948.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/52704076935.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/64e821b8a3a48d7e173176115d23e24b/16694525523.pdfIn PDF document text
    • http://kachelofen-prommegger.at/79562508677.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcce99b84b---nakewurisuzanulej.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_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 10448 bytes
SHA-256: fe8e978baddab21d486d136f8e6314906c9895d34b04d4c5944d28c1f5bf8c99
font_01_sfnt_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16604 bytes
SHA-256: 9f7d6f86f87b086714c4e59f57d054c366399c124a6b69aa099d30c4e94fe7a2
font_02_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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