Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f72625f2b688a3…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 03:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3d8dc725918837e91fe4081091b0f88 SHA-1: 0968f9cec634b79b36a13294c99f0e0346c413e6 SHA-256: 49f72625f2b688a3773d0158357a5c19752dc19bc3e9fdfb25917aae5575412b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://chcial.ru/uplcv?utm_term=how+to+fix+a+wine+chiller PDF link annotation
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99b907ce5---42218395212.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/88532738395.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210610074544146.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/7694284111.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/jawobowigu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/28514277806.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/95798049098.pdfIn PDF document text
    • https://puppometalli.eu/file/40931287378.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/weminuvuliguzul.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/99199820781.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812e772ebbd---10134407011.pdfIn PDF document text
    • http://texmet.pl/userimages/file/5106738832.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/34560521830.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/zomudonarize.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e867428b6---selafiterixifet.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f02df37a9591825ac00533a1491ab33d/jepuzudagum.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c8f0d00b0b9a863410c9fd1347372c7f/kewexibovejot.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc94b24f2---64664396200.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/9603246745.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75d7fa804445241fcd24a7c3f9a0c96b/niwovebepiponan.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rs0svmumkm6gsa5u2qpjb9j6k0/68600760055.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071872e16631---66296855645.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_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 10444 bytes
SHA-256: de251dfc2e1e6cbe42134f7e61436646202273e89fece64d7fc690ca520b7aa5
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16728 bytes
SHA-256: fddc246dc3970c80142061b39c4139ce09c3b8fcb72830fd22914164bce8f1ba

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