Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced2f8afe6a603b7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 06:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 09c59a42e267b29c3a3854ef0a133abf SHA-1: ab33bc4465cd9b67df9bf4b330251edeec800b73 SHA-256: ced2f8afe6a603b79a3048f93988efbdd9b31f7a805c5c5c2650161c03b4abce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, but the heuristics and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=mise+a+jour+logiciel+galaxy+s2+gt+i9100 PDF link annotation
    • https://jobtiara.com/files/files/pilos.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161371a0e0395d---falugodetesujoveseninon.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911121210.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/puvawulexes.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/pozijisapegetoxetiwuvi.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/45535967560.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/bapefebokupu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c5390e2f050d25e68e16420b03ec2378/kagiz.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/wodax.pdfIn PDF document text
    • http://orlickachata.cz/files/files/sibuxatejoxivisipuwapawik.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/44437985047.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/41469823975.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/daf9aff5318fb8e5a9af66a5462ff58e/dizezoropafekumamuz.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b4nsd4qkqess8tdokcbsgoqq54/banudin.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/1394025495.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f29ea61b3---vifefalisofo.pdfIn PDF document text
    • http://status.cz/UserFiles/File/vozafan.pdfIn PDF document text
    • http://lgassociates.in/uploads/41287543757.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xumeliserezel.pdfIn PDF document text
    • https://ka-base.no/images_content/file/67538830525.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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 18568 bytes
SHA-256: 80cd08049fb946f561a3be700a4d8db66718b0cf54db730c2c4b92823d7d556f
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 11200 bytes
SHA-256: 2e6d6bcfa36609346ed7fe806b4bc22fe576b04568d8ca69ea474f50ec049c78