Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f77dfc635ff3b77…

MALICIOUS

PDF

67.6 KB Created: 2021-10-06 09:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d417d478cd57535df78d8721cf48a46 SHA-1: 387b1e7a31ac193c1759b6f8dd70bdbe468fd5aa SHA-256: 8f77dfc635ff3b77f247052eacbeed42949a3075bf5e81e79ea4bb03c42ca6cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs point to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=the+nervous+system+test+answers PDF link annotation
    • http://ipayon.com/root/FCKeditor/file/12189788994.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xufol.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/23o2hjl1qretg9d9tt3ohqsic7/zenor.pdfIn PDF document text
    • http://agilesolutions.in/uploads/somixipalodosovixarate.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/55579755795.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/13971340937.pdfIn PDF document text
    • https://spacio.hk/attachment/file/21425953165.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kipepipu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/68280923065.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/wexit.pdfIn PDF document text
    • https://thietbigas.toanphatcorp.vn/media/files/tojosinuvawedujed.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/midobu.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/1943342359.pdfIn PDF document text
    • https://12shio4.com/contents/files/bunewiwizafexuxerot.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/63463099069.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/11195896423.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/loruxasuva.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daca47cb96---45406865270.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/295b2f6f18d506351718efd834088a4b/wekakutekavodurapode.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/6169763094.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/nuxapamukewodavi.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/makesakigi.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_off0000add0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD0 10564 bytes
SHA-256: df24163989b9492027404d18f3462191235ba3260f810243b1b9d40581a57b65
font_01_sfnt_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 14256 bytes
SHA-256: 4669cc85e04f49da28e2b4952e190d4d7c4065ae1abe8d6f2ec3a5d13b6a7ef4
font_02_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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