Malicious PDF — malware analysis report

Static analysis result for SHA-256 785c938423a9c8f3…

MALICIOUS

PDF

87.5 KB Created: 2021-08-15 21:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec83875342a42491338ad6f6834bd41a SHA-1: b0f31a5a1f9f7f70469f97d66b506f5ab9ef9173 SHA-256: 785c938423a9c8f3276ec748194c978d5d8ce28ca103fa237863524b43b2b3b7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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 http://elisa5888.com/shopadmin/upload/files/25118394414.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d5531a95---lizijodizoperuwe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cf55d1eb7c3dead2646c55a3900292d/44061314955.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/arrha1enmlc5f7pqtjpr3pon4p/60156346581.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/panonepujomaxo.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/92903905977.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/vidixoloxobetejuvuwowavix.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062709574775354.pdfIn PDF document text
    • https://csn-alliance.com/data/files/21701788579.pdfIn PDF document text
    • https://506hlapeta.com/files/file/lodifelibidolav.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2aa6e5bf7ea11b8d5650eaeeb22aa56f/49937680490.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098c7f54ea00---laladukifanojozus.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/kifozebopoki.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/19047028486.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/69526712237.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/ludamezuvoxakugofi.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/novuna.pdfIn PDF document text
    • http://esistore.de/userfiles/file/9619750367.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9ecjp57phi246hotbs9dpqk871/zorakolisitodavilarejudir.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/xefimagonimoxejigamapigo.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108041851189825.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/254be606dc792371d1610f752dcba117/16941054216.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lujumaje.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106270348387383.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/37eb23f272cc763c0432bf64ea6e93da/44189682304.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/86477707688.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e297a78d---vinukipoxigokolewigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sintaxis+oraciones+compuestas+coordinadas+ejercicios+resueltosPDF link annotation
    • 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 11080 bytes
SHA-256: 9acad8b576647588b9608a29e97fcc66e2bd165bcdb7164cb797a9d7819c75f7
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 17824 bytes
SHA-256: cfabc606e79bebc4377918d4aaefd848c98d35a9e34f1f3aeadbb3474c8cbaf3
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1