Malicious PDF — malware analysis report

Static analysis result for SHA-256 54711084207d0e35…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 07:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c3b5549e0fc5e52fa2e94d63e93e803 SHA-1: 5048980ca16473f1d1018a4ec093bb76a1f704ae SHA-256: 54711084207d0e3586f2d97910f466ce28f6510427875098e91e394e797f8f1c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, several of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f01e072b---98512577374.pdf
    • https://ladymamashop.com/uploads/files/202109251757564148.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439fb9cf13---keruwavavewo.pdf
    • https://halead.com/uploadfile/1631748025.pdf
    • https://reha.bg/content/upload/file/butanixatarimen.pdf
    • https://mamo-tato.ro/userfiles/file/rosidigiwazunuwomupixa.pdf
    • https://suativisamsungtaihanoi.net/upload/files/bigikikogagefubogolom.pdf
    • http://stmrcstvm.com/userfiles/file/24638208353.pdf
    • https://clearpatth.com/userfiles/file/gawepam.pdf
    • http://av-jet.ru/userfiles/file/zepafumi.pdf
    • http://ronaldtan.nl/images/photo/gufavumizexeninusaduzogif.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d75d501c---20904608511.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/89261419895.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/mizedejepolorobebokisop.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/siveduv.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e204a29218---dojowuxubiderul.pdf
    • http://axi-hohenstein.de/userfiles/file/pexozakan.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161399845357bd---95754409151.pdf
    • http://inspeq.eu/public/files/38801597401.pdf
    • http://halaljones.com/uploads/files/16800246091.pdf
    • http://2990592.ru/ckfinder/userfiles/files/80944128952.pdf
    • http://njbeihang.com/uploadfile/file///2021091118075611.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8aa82682---60306178059.pdf
    • https://autotronics.vn/userfiles/file/japanozuxolubilurudanis.pdf
    • https://comfort8889.com/upload/files/xajopogudixawidugi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bloons+tower+defence+4+unblocked
    • 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_off0000b480.bin
9abd745cb4283fe707f1649450b66193955bb2db6d6fe5e6998b3ac1cd70fdd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB480 10764 bytes
font_01_sfnt_off0000cd93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16792 bytes
font_02_sfnt_off0000e5a5.bin
95533724c89da5fea5214fd805c45cf4edee25a288230ca1e1a4804f336df8b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 17608 bytes