Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0eb831db2577e63…

MALICIOUS

PDF

87.2 KB Created: 2021-09-22 16:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cc3732f198ab310a00af4e905b6cf23 SHA-1: cd05df4bb427c48e38d02cadf7357c0ba04012c0 SHA-256: c0eb831db2577e6361291fc334bf2c3f812914d649035cc488e5740a7ad30646
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fc-junajted.com/upload/datoteke/82614465393.pdf In PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/gifoduforogizapakevo.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/nonusedezimexurigamigoro.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/ginalifakokeke.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/nesurisirijeroke.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/mivisowa.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/futitujepupudose.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd28bb60f7---98746919920.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/vurasun.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pozamavajat.pdfIn PDF document text
    • https://fototipia.hu/files/files/29249849227.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/35813755776.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6c48d32b---benuwis.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/97084340753.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134765c9fb5b---22443488225.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/roribizeveditotug.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/77564330650.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/48314090895.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/rediwuxomodut.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/18630123048.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/70593578936.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/79207739739.pdfIn PDF document text
    • https://cmf8.ir/data/file/69174997980.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/21479381984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+nobody+2021+online+free+123PDF 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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 11116 bytes
SHA-256: 408481944acd9cfbebb7056b9d05b40b30e98dcae839d8f85278e0209141fda9
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 18284 bytes
SHA-256: 1b0b04109fefb6700ef03c460a908de1e332be86b2ce2fcd1763d0011ff49053
font_02_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1