Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efee375fc6f3676…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 12:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3f42135ead11c485408154f5a45873f SHA-1: c88603ae99565ae4624588d65a3261cf61a5dec8 SHA-256: 4efee375fc6f3676ed83b942c2db651ef862e17fdbde96ec51c1ba2ae282bbc4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics supports the classification as a potential spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=kill+ragdoll+3d+mod+apk PDF link annotation
    • https://mygoaltv.org/ipp/images/uploads/files/24381010222.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/89046452029.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/72787485766.pdfIn PDF document text
    • http://checopharma.com/upload/files/penavuva.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vawofisusijinamirefafinow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6131f3966---50572966147.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/depisavo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4c3bcbff31363752eaf8235b9996ed04/56510849503.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/92270495873.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613435fa53009---limowolubozabumaxosetu.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/lolenur.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/94181888944.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/31663547442.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219141116481073.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/89836159360.pdfIn PDF document text
    • http://youil.org/userData/board/file/rivikopaxopigudelajixoti.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_020840_173.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/malezigikomevomo.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_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10488 bytes
SHA-256: 56beb240a228976d1512a0f70220ceee73888c9c78af7111ef1647149e635672
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 18852 bytes
SHA-256: af26e07f87112ded76808512bae180a3a9ad54f13addc5decb85341d55ec0e14

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