Malicious PDF — malware analysis report

Static analysis result for SHA-256 8722399fdd6ec3e4…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 07:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5000088fc9811b65dcb2a24d865b3c9d SHA-1: ce5de8a8c66ee28834e1f0a1e8d8c3a2d6ee7616 SHA-256: 8722399fdd6ec3e4b28e2dd9b5121096d30327808d09c1700f9edcdbf180fabd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=the+doll+house+pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/27928201798.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ojgtf0g3pn5gsfq69nfm1vm0dg/16557323672.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9e03841b6effa29be79dd9624aac184d/gumipabafetikuvire.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84ff1e31d.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96d9e8711---46410629283.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5c9abe9b13571170f59e74bdb2441e5a/ronudigakok.pdf
    • https://ferest.ro/imagini_ws/36856938897.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d031c21bad---kakatovu.pdf
    • https://etonbio.com/newsLetters/images/file/71115349371.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/veg6ei91ddfst152i4ttpnti65/mojewakibopaz.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b4384a72a6d---91372468370.pdf
    • http://aldo-ins.com/userfiles/file/lafelifobejewix.pdf
    • http://unseenadventure.com/userfiles/file/57855521446.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c68f4ee975b6bd7d9bfffad7ab5981c4/ladavidadusutagazid.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8247a9909a938b0eaf02206c1f5b5fa5/gajevobodiminovo.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7de48973348201423ce9e72c4b39d099/kezimoterafojagofura.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098c57d77c51---rixopifedosurubunule.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/9d07ff7e217b8997b2edd606f562a09f/30477601487.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/965309261e77552c49b717c9503be366/fimogenuvaxe.pdf
    • http://keacg.com/upload/files/15047725879.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5773de9bb2---68824356810.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/a46kl8358qntv5in7te3fpgqf7/7561440104.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_off0000e939.bin
744443a401e575ba210e29a02a3e309e6750bc5ab94fe64e2722847b1823125b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 17672 bytes
font_01_sfnt_off000116ca.bin
9f16b0511bd9c560fe6547944e1a26f4b6b521870bc5389c329f1075c50782fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 10104 bytes
font_02_sfnt_off00012d77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16792 bytes