Malicious PDF — malware analysis report

Static analysis result for SHA-256 75eaeaf171d592d1…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b87ad6d5c813dd83ec17d98e3bb2960c SHA-1: 25cba52277c799cd0588208e442d94a62ccc6ac1 SHA-256: 75eaeaf171d592d1af7333537ed7a3481bf14b2793b8edb4e5cf47ff04b17e86
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bednidhitraders.com/userfiles/file/povefobonasamerefopozig.pdf In PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/78388719866.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72a36a5d7---resunamixoxiwilasomodi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41201007a---dobenife.pdfIn PDF document text
    • https://menu2uplus.com/images/file/17054453105.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d9b1993e---5347389026.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/nonutarelifexobisamonot.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/26580990600.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad029985bd5---82372790168.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1390ce64c---vopigezawefebaraxupusirap.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/13521144af5909b138d1ed30d59e028d/lazebofupemag.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/70959391628.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae08c7e7000---55087356613.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/suvejetuki.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/53883455635.pdfIn PDF document text
    • https://mszukam.pl/dat//file/25963505891.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/zabatovajatuxuvemuvelar.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99cf574a1d---kolas.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f7d17099---juxokagobevikazerej.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a63b82fd4---sexonul.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/49115099087.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bakimu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/wizapebupi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8eebm1rdmh702t2b7k6klsd7s9/70743860489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=family+life+cycle+sociologyPDF 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_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10468 bytes
SHA-256: bb5d40bbe4a5d0a0ee354d28744a2625107ce7b15db96dd21dab037480fea519
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 17280 bytes
SHA-256: 7d9b74132c3db5029980506f6965d9aaeba83ee692f5e1847d4d976a250921b0
font_02_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1