Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc8d9aa00e865d1…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 03:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c43beb94168f8f2ae898406e3a9e8789 SHA-1: ea502584ee70e037cafd3cf347c9876e5ebc4bb4 SHA-256: 1dc8d9aa00e865d18884ec2ad112186c4ca1016c873e22569b6cdd786f2ee4da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=meaning+of+tension+in+english
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/54083051967.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08e830253---7919126301.pdf
    • https://andana.us/files/files/97331719171.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/62503909d4d5255703ab9a9a57076df5/42270128196.pdf
    • https://mides.vn/images/ckeditor/files/77088420074.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2cdcde6a---junefonuragebokupe.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/35936955607.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6b30ce5a---vofefurozekibiwapu.pdf
    • https://motelandratecuci.ro/userfiles/file/xujatibazunopixetaki.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/17031268212.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/66460655522.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9bc7c22f92b72cb8f3b31296abbb7f78/tomaber.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a522838702c8a90b53ebc3400e7b435/xifemifopukobelawefutodo.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceec747724---jiwofuwun.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c000ded459---16264777032.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e2554c26c07dc4b96485e9601ba4b478/durobukaxukebuxabov.pdf
    • https://madspot.dk/ckfinder/userfiles/files/sarabibesapot.pdf
    • https://filetorme.com/upload/files/gakesasevikopo.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8510bd118f524e7e4f8d1eab43aa96ba/23980703396.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/99649409761.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823eb264b46---68740660098.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077580ccbb11---zutexavo.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef42f9cc6d---gujupaz.pdf
    • https://jdlpartnerss.com/userfiles/file/32846911067.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_off0000e4dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 16792 bytes
font_01_sfnt_off0000fcf3.bin
80bea12c88be9726ff8b9d67996398a3aaa6499b1fcf2079972a2d0460b0f4fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 10388 bytes
font_02_sfnt_off0001145c.bin
aff92d97b33a26afef09a9d12ba171a3a68210cb1d1b35a3c267a4b8a7a2322f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 18036 bytes