Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3340ca48d96e426…

MALICIOUS

PDF

96.1 KB Created: 2021-09-04 01:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c3ae6f488239635b1d9fd1dacdc841c7 SHA-1: 66d5fe7733203a487da027af1b414dc279f52501 SHA-256: d3340ca48d96e4268bf3059b1e5822d2c9686f5f70016350e9acfc7d70681b25
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The presence of numerous external URIs and link farm characteristics strongly suggests a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://inwebjor.ru/uplcv?utm_term=converter+aquivo+em+pdf+para+word PDF link annotation
    • http://elitvorota.ru/f/file/55088464903.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/9526663104.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afddb9ded9---zakovonejexuwipezutumoti.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/16494966660.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/ramuxoropojurapukizef.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/36502589810.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n4o4q406mu8lubrdrlcbrt4qs3/39321422400.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/bamolopotaxanabemaxu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6ad19c82ed18b5511cf7faf100dd0abd/98406092362.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1can9stakmubtfquc994k0ps55/sekaxun.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/sozigunorumibe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16106b0136a837---bakujisalenis.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b944b7b37---xuvikikatemolukubake.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/45765434983.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/xanawopi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/raratojadesagevivuzu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zenexisedozavezovu.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/ledepozef.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/japokatavosileroja.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a3590154---jatifapup.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78f175a8---mutijo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e268999d69cdfb7a64c391803863d2b/43969825165.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb01c93254---74100376916.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/dumobup.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3d37c1c2c81f739499ddf6f50b0d8a4c/63695610802.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vopegipu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59871eb53---mexux.pdfIn PDF document text
    • 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_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 17588 bytes
SHA-256: 898071b5c3f84e500ef749b1a1e8107fceacc92cf97e520f2c1b69d404904c2b
font_02_sfnt_off0001597f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597F 10876 bytes
SHA-256: 9af5641e139c41e3e4d8700173ad4db5afb66572c91996161b183ab1de50105b