Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c63e493c230bac…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 11:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51e16b3e42b252c9f90e8de3314b254f SHA-1: 72f174477caac0194f7e70c334193f89645f10e8 SHA-256: 78c63e493c230bac45cd69f319852d482ec0b978735df78a73509b0aa975067f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=watch+the+vampire+diaries+season+2+online+free PDF link annotation
    • http://podlahyadvere.sk/editor_uploads/system/files/5833088477.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/49270392245.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/jogogukixujixiwunujunogu.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912182605535441.pdfIn PDF document text
    • http://telektrans.hu/editor_up/satavugigujitetevoturu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced622a733---zezamurowidawuvepe.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/13302833247.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/matupadi.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/55288255457.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/raraniwinaxoxof.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/95328124081.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/zulufodenedajifenofa.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df34f997a0---37361917496.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa634a0d7---17170247750.pdfIn PDF document text
    • http://suurelepa.ee/data/file/xedatinosozibubak.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/soxejulinotisilezifidi.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/91087292562.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b09c4d8e9---64260022841.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sewime.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/gikija.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/61450010392.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/zezufafoponegetifuwogilef.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/55489144848.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/88439f1b2bd86ca7cba6cbb3fa123a16/dodagoxomug.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/72982283435.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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 18020 bytes
SHA-256: 06a384880d1fc69c05971ca795346806648c8027db90fad76d5afacdab61c2f7
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 11064 bytes
SHA-256: 1711bab0bba372b44a74349a03050c028966e73e6553e0b17e6aa49dc983d554

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