Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9cbc8c73f5d78e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-01 21:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 118c962a51b6cf69d4420ebce5709fb3 SHA-1: 9a6aae86ba6adb83aadb6c24b4cdeb21c77e7f9a SHA-256: cc9cbc8c73f5d78e05b7ba17ea6cadd5fcbddff988143c5ec9ef98105e68b4f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=good+conduct+certificate+online+application PDF link annotation
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/80542507082.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb886ddc4---23974836186.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72081063694.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/71782011012.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/tedafitabakusereselevif.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/69996718761.pdfIn PDF document text
    • http://ezibra.pl/upload//file/48133605279.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4254a5590---28806378066.pdfIn PDF document text
    • http://builderall.info/userfiles/file/39110816773.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/53302140357.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/245745298.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/josegiwosamoti.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vijawotogumaja.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5992860885---64275767928.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af9894bc3---69759202119.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a154dc40a---974731072.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb1892523---63839194959.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/32873376273.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/zalazibegidulobix.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/fafofizozizubexef.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610592ede3500---62507306959.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/sasolinupanuwowukorum.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_off0000b824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 14392 bytes
SHA-256: d7c65b8b61658c2a702e66f56c3935c7843108eb24581cfbaab3af3d93a1f453
font_02_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 10584 bytes
SHA-256: a4587212f35985d832655da8913789b43913656bc84d6e29d4ce2e513d534572

Open this report in the interactive analyzer, or submit your own file for analysis.