Malicious PDF — malware analysis report

Static analysis result for SHA-256 5813c9cbfbbf9b23…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 05:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2dfadcab97dae2cfbcee6347e8bc37b4 SHA-1: c4ae25a2ba54f027079c0fef1d0896e0da72c8ac SHA-256: 5813c9cbfbbf9b23edbb43eca12628dead45f54018eb3ca36e04ea8c12c00d53
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://avigailpekelman.com/sites/default/files/file/81021180433.pdf
    • http://zxsolar.com/d/files/takevigupiwikal.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7579rff141qkuj6ls255upt7p/miwoferobugudoponokafi.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/47b5f1584888483570fe89634454085b/84086356547.pdf
    • http://schs1968.com/clients/861610/File/jixutisowuzuj.pdf
    • https://atl-50.com/files/file/tebakawamaperabogovu.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/83137517154.pdf
    • http://star-transform-moscow.ru/uimg/files/tivaparezekozas.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be17f457afc---zimarod.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b7409f03---beduzobagofu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a9f31bec---78998835804.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b81dd23977282789ef51df9095d0acd3/9131296081.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960261d40b2---duvutipiwadogixatiruro.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607768d149ef3---76092037798.pdf
    • http://iehyun.com/editorupload/file/biwuzugot.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/2680341686.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dcad1438d---1175482825.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57a927372---69530856775.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a0c1c0472---xaradarepidumotebugib.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1a6c58aa---92457119232.pdf
    • http://nwatchonline.net/userfiles/file/notevigosevotak.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a8c0cbea42---ruvisakuzi.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/67307190400.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/36240888814.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qd0u2d8tqq187uhbu8umukt4u5/dipukudov.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bed8f4b1---dimasoladopukefupafig.pdf
    • https://annjulieskarpmo.com/userfiles/file/43586016865.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=class+9+chemistry+chapter+1+questions+and+answers
    • 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_off00010db0.bin
de41e8199f88c6546219e8d7a3cb46aac5a2b2bfddd5cb1a8049e24de2c58d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 17796 bytes
font_01_sfnt_off00013c5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 16792 bytes
font_02_sfnt_off00015474.bin
d3095ded58b3ba86fada7c6bc5a22393fdd663fecfce816a1937b20d707bf911
pdf-font-stream PDF embedded font (sfnt) at offset 0x15474 11476 bytes