Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e296d57d863b20e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 17:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa1361992acdf9a44fb5f3435baebce2 SHA-1: 2ea22442efa8432ead5b61af581eb467f3776c79 SHA-256: 4e296d57d863b20edf3fd9b6975055582a25cb0414e27847c42f0958ca7e00da
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload locations or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://inwebjor.ru/uplcv?utm_term=appvalley+dream+league+soccer
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bfa93417---gebujonemupoloduwipazo.pdf
    • http://vendsol.com/userfiles/file/rejagi.pdf
    • https://hunghiephuylog.com/upload/files/20800613910.pdf
    • http://mc-opony.pl/files/file/19632359794.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fef85d59ae---vudapo.pdf
    • http://idealthailand.com/file_media/file_image/file/wixatewuli.pdf
    • http://fluorescent-training.com/file/80315330482.pdf
    • http://ave-france.com/pics/files/zuxipusaneduwikezuwe.pdf
    • http://hiace-yoshikawa.com/js/upload/files/53677544585.pdf
    • http://ozgu-yapi.com/firma/files/80482153376.pdf
    • https://dotcomtravelegypt.com/userfiles/files/sefazanasufonuliwi.pdf
    • https://baigiangtoanhoc.com/upload/files/gefuwapipejibukotow.pdf
    • http://riccaassociati.eu/userfiles/files/xonedamafonax.pdf
    • https://gesema.com/UserFiles/file/25310549474.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/cd9ff4d1f89fff7aa8912db7efaffb8a/99663799018.pdf
    • http://lenosada.sk/editor_uploads/files/dusapinatejozapanel.pdf
    • http://tajesink.com/Uploadfiles/files/35246562525.pdf
    • http://zhfangyuan.com/uploadfiles/files/xasaxamap.pdf
    • http://portalpr-b2b.es/img/user//file/_0926232001631369060.pdf
    • http://theflowermaker.com/uploads/File/fabiruzegudajikilamu.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/31430590860.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xizatenugu.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/51436198311.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d516.bin
9c0670c2fa15a2c047d2e92d64604bbdbc7d5265412f3a1c82812abd6d12f902
pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 18432 bytes
font_01_sfnt_off0001049d.bin
5c4e42a947d67c58a707cd14d39eb31e2a28285dfac28c9933c4ba1331d25c33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10824 bytes
font_02_sfnt_off00011d7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 16792 bytes