Malicious PDF — malware analysis report

Static analysis result for SHA-256 1704acb256984b40…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 06:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 709d980645c029b62cc19122cf08bbe7 SHA-1: 9fed7693092bccae358e4a59d9b236944f09cd89 SHA-256: 1704acb256984b407d11ae01130d96081738d2b8a4875e436565cb61a4833880
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a callback, consistent with tech-support scams or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=customs+and+excise+rates
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a21e68544---37611930473.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14495f997---wuririwexedimupipobu.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d926079ea20---17310943731.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/vapapasusupirexi.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac3f03eef---sogagisidiv.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e1b9925d66ba0c4f3b17fff279d79d2f/36547814533.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/65462661693.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7at0ne62s62pktd1m00mmou6o6/33278254597.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae27b9c5ae---4979701011.pdf
    • https://faltprasten12.se/anvandarbilder/70/files/90577590259.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080429602d7c---bidid.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/9cc4642db81419b5cc3ddf78a5d70a77/vikivetiro.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19fae711f---89975443775.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d7451ccd---fanajebesoxumusaxuten.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568c6ee50e---84177991.pdf
    • https://b2b-intelligence.it/uploads/file/jebuj.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1694884908dc4464f2b3c4218efbacbe/setegoboxefatezibalejose.pdf
    • http://goteneplast.se/files/images/file/92531021927.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d312f607a3---46724863587.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7642b5c8---dekotisixe.pdf
    • http://zonweringbelgie.be/ckfinder/userfiles/files/26479411632.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/filijufelusogutizijerudi.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed07e946043352ebe8aec30363846bf9/lujetigumag.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8002e0fc01d6792fabd13b3e530b1cda/64455026897.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76c.bin
66042fa23fda3ac7a9c15f02e4900fdb4e92b5f1ece14fb48bb8a5b720ee7850
pdf-font-stream PDF embedded font (sfnt) at offset 0xC76C 16300 bytes
font_01_sfnt_off0000f1be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16792 bytes
font_02_sfnt_off000109d5.bin
876e74680cbbea459fd3fd1aa60b00baf6845a1fad32bef07956db9bcfed6fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10720 bytes