Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b073cd8213803a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 17:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c94e1940288cd450ce08f370fed0647 SHA-1: 3d2998f44120fe9513bdd1f8d235acc1bec14e50 SHA-256: 49b073cd8213803a6e901059b14d9065e10c50fa0309a43f108b2c8993a07a92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites, likely for phishing or distributing further malware. The presence of external URI heuristics and the link farm detection strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=computational+problems+for+physics+with+guided+solutions+using+python+pdf PDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3656bdc23f---81012491234.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61159235538.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f0b37bcb01af43ee129cb19e19d724e8/tetagewojitunig.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821ca006b3d---66365688427.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094326823f69---53726154089.pdfIn PDF document text
    • https://penal-garazh.ru/files/wijetamabuvugutini.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/89483525557.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/42489609224.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210621165310105.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/latokaxogof.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/jelegidodufixijaxa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161062850d99a9---lajozufowidetuzemiduf.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfddb74ad---39982390638.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/pebafakitem.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/guwebupesetuxege.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09f71b6fc---wolobidorotovu.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/soruzanij.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/palozosapetogosevokobisaj.pdfIn PDF document text
    • https://ancoraeducacion.com/images/973709244.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/50018388677.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd71a66883e---mufujexotebot.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jobebesomusubizuwugif.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d28c8f25---65769093698.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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16908 bytes
SHA-256: 6b2d56d8bcd507fce3ba2793506ab9c6362c94976f1e41c653031049d86479cd
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 11536 bytes
SHA-256: 31d4a6d3958a2187ad3698e8f2f9ee6dc4ccd27b1aa3e3a639d1a0e447bb113b
font_02_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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