Malicious PDF — malware analysis report

Static analysis result for SHA-256 653f0671c8cd86a2…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 13:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6101f192c0af27e75bba88856484d5ea SHA-1: 19813b4a17fdcb6a7ed39a6d67526026952744e6 SHA-256: 653f0671c8cd86a251c35fa49bde65ab30cc946fd377b8e04186cfbfa4fe2764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27dedc6a4---tolumobuveniko.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/q8ksuvlvds074k0kvo24r5q67i/pobitu.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca871cc2e8---94562363141.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607328f6bce58---dowedetonimukozopude.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/456321f64d27082facd89274b8052145/78396764212.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609918ab8088d---76177388695.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf2933626---rebavepuf.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/acsnddh1g1kdrff4drj1m3bled/3039507631.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627075030.pdf
    • http://thegroverestaurantnj.com/userfiles/files/3539705700.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a959481977c03c57a95a55400a810bb/32914898269.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8ba8d17dd41f7d3e42c549a3a11c8838/deben.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47586cee5---fowitetopirenoguwe.pdf
    • http://worthingtonpark101.com/userimages/tovizopowumu.pdf
    • http://dzstock.com/Upfiles/file/wopubawigifasimolefe.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083fea842349---zinuwut.pdf
    • http://sparkpro.lv/content/file/dugesepebijepatakokesipix.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l93kjhf69p41tguvpsbnjgvg67/seden.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49be3bd8c---kamozepuriguw.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/qg3tqc852q171n9qh111725ik6/92067765795.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffee809280---zupipola.pdf
    • https://vettercycles.ch/userfiles/files/87510031206.pdf
    • http://elite-nails.pl/Upload/file/13077697383.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b007d5d372---pasegagenivurudon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=easy+still+life+pictures
    • 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_off0000f332.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
font_01_sfnt_off00010b44.bin
abce921a761f10d926001786455d4fc240e632d5ad73b6b2725e3145b2f8a680
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 17168 bytes
font_02_sfnt_off000137fa.bin
ba4cd8f5186d5022da8163366e754c06100a5135ab9bfbb3c161b27e6f5ec760
pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 10444 bytes