Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9940beb13ca0630…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 00:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b43457c0eac3a7da40fa78f129051d8 SHA-1: 5619fac33ee82c49740eb4d4029ed7ac60b5e7a1 SHA-256: d9940beb13ca0630d5eb084e09c3130acd3a21ba3ca9bd4c9e1875b50e09e38d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/20640342684.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d90d8f563---zofonezo.pdf
    • http://infrabud.eu/fckpliki/file/10358390464.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/prcs25jdti2lnkvh07ksuaqle1/44367256978.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b090ff62f3d---xufojuripewuribafidej.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6e6648d9---75210933837.pdf
    • http://ijdssymposium.eu/upload/minasidopirazixesodewenen.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13bc88ffb---julutogilozegemibima.pdf
    • http://premium-h.info/files/files/12937206993.pdf
    • http://dental-forum.ru/userfiles/file/pusejugabunopapexumi.pdf
    • https://parklanehotel.asia/userfiles/file/gufetim.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/41bb3d42bd7d76afd819bb6cf3638fc9/moxamexinaxiwow.pdf
    • http://hasyo.net/files/file/joluxebegeveruxadez.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073539f6ce79---93283616770.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/legadivona.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3eae8ae7---92913084013.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/435c0e24b78f9bdcf52bedefd0f548ec/lodijes.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607411e41cb0a---65140372786.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6d04d4f5c7022d260790d07f7bf075e2/71632378884.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1634a00f30661e08f884e22d0bee64f3/puvedulidanujazipiza.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/u6d9rdh8m9n0qke5d5o93sud57/72510647270.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/dda114663a83d9df639290d8d2704605/92394413339.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e889205544---xinipijamefepopid.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ead6ce69bc37810d341ba81eb9770e7/duvegowuxevo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+are+your+strengths+examples+for+interview
    • 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_off0000f8d6.bin
e2961bdc984d481b6c50e1b549f327691541a1f92b366a5187fffc7e523913cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 11268 bytes
font_01_sfnt_off0001132d.bin
d84eb26eba5bd1fd873edbff813595056a22ea0d29ece103bfbe9e60e243b16c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 17500 bytes
font_02_sfnt_off000140c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 16792 bytes