Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fb911bffbd9c0b…

MALICIOUS

PDF

82.8 KB Created: 2021-07-05 06:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cc737d43494837ce6ddeef77802542ab SHA-1: 51603359bd09ae60db1a1c2ada47e9d5429a0f34 SHA-256: 54fb911bffbd9c0b1446b8e5756c57d1455b4a949a2199d325eb624ff0e10c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=cut+pictures+from+pdf PDF link annotation
    • https://parc-hotel.info/file/tikisodazimupaxeramukoton.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wogemufapuzosonima.pdfIn PDF document text
    • https://anfauglir.com/images/file/88905451699.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfab9544f---vaxovejus.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a8bt4cbt4v457nh418491cahtf/karewujokipufugis.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0f679b95---40854391753.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078581b5ca20---32819115864.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8e69c00a3b631842573b7aec86e4751/71094018042.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/52001410407.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d5a4b3be---48891799327.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5e4a1e68a22cdb06248493e6bcbfb80b/94532207483.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2121f83267026ad99af591da6dcf613e/zomidabaxerom.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/bezuwup.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f002891b3---fukekevititipazolavu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/pdihhhhnet7irmc05domd15ng0/lifojubudarodekenu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee8735581---vekunufotatikamegavufowu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/43021292052.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2a288cf0---degitopoxufofadon.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6simrjfcnpid019dgjs58b4qso/batebevotukikojuzan.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c970584c13e022e5b54503120d078e98/wujojujoxixotugor.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/ravulidebuk.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g6ns02e1ngu4q3vmboafp9gd8m/30739721177.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/709f095e6cee3701efbe1d2b62a8c9ca/taruzudefizolokadudawif.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/38287e167e0147cec6aed105e57f20f1/67072749088.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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10600 bytes
SHA-256: cc8525169598780e274ad915ecce8fad621b8eb1ba10c26ac2953f7288a75a48
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 17968 bytes
SHA-256: 7c8646a71284bbc0639ac046ea8b4e1a0734ef656036fb29c935cc20b1b11682

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