Malicious PDF — malware analysis report

Static analysis result for SHA-256 408ad62e2e8c42c5…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 23:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e424104e77e605c41c99fc1069c5e7f4 SHA-1: 73577f6e7a0a54ffea9b6150090bba0c2c62aae9 SHA-256: 408ad62e2e8c42c5963f1ad3ea8188d9af9487c80d326c0ed5eb497d499fdf65
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, likely intended to host and distribute further malicious content. The document's structure and embedded links suggest an attempt to lure users into downloading or accessing malicious files through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b9411e5e---vosimefasexajose.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a2ec3a51---86210261313.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210611091037_fvnrix.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/88438492511.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/71019617024.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804d020a30---43324238990.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd30083a6---jikub.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86cd6c2cf---26261373759.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0ioalfb721gr5fet4988g9pg1a/7278077575.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/nibulagukozojawulaju.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/juluxuronurekij.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/64580615722.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jafufojijalideputidi.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/36027688602.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/xafusisabezawo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/13795980534.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/roxufamelesifiw.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab007627965---gasaxanapovug.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ubqoaqqt57p8jf07oouicuepj0/wefijazurigujo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wuwipakiduzupukofapedowo.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/dujanadoteri.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a7efb2f---vomasitugamutat.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7a5f2e10---50184775732.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc85ad225---99053904321.pdfIn PDF document text
    • http://jucal.es/images/file/fufebogusazujif.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8470d58478b8038bef4ee32d0c846828/gafenezerasejeseda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=who+would+win+polar+bear+or+grizzly+bearPDF link annotation
    • 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_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 17376 bytes
SHA-256: ff4260df1695c2f4fd9b3f6aec58016252a6ffaa08552d798529fc09d6372bda
font_01_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 10896 bytes
SHA-256: d6b2a5e9b35aebe3c6a533e2ba5384ff8ffd11ae7b00f8f95588cc76bfab8c3a

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