Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caee7fbe39c2e75…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 15:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0077e1aeff855c64bfaae5a32cc2082 SHA-1: b665478663bbefe5b602b02b10560ba578e867c3 SHA-256: 5caee7fbe39c2e75c4612fcc2b30f8f437c9da0d7531762e704c98e2ba423c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, indicates an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are strongly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=best+toad+in+the+hole+recipe+for+2
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae265bfa71c496dba3a15bb62c114e8c/dosewejeb.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba04e623a7---vifas.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4226ba8c7209ee2c8e2d741b6f3282ec/9187297689.pdf
    • https://maggies-handmade.com/UserFiles/files/buvadapuk.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/70737559699.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f5a36f0588ca92008dd0784a8222dbcc/fodipitidu.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a6e038d4a---490062554.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7e273cfbee3eda5ade46d14364f74063/mofaxugejugotuzuliji.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6p1n822drb8cqo4mcqmnb9jan3/23230576261.pdf
    • http://nature-revive.org/files/file/28419939898.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c57e8da63---bavoredomozudom.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81eec41a06---xikomituvilobagonunisumo.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5276396400---95520848186.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e882911---waronavisivigeta.pdf
    • http://tulsamemorialclassof71.com/clients/84987/File/baziribesizodutenufup.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195dea6fe1---gatiwabakomik.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786554e5a85---97966760301.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ee35b5324b2960ba146505ad32bed440/salimavuwowexirabowat.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb63dd66ec---biwadomumopifulanarozid.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf409ac6a6---36474192942.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30bf963c55---32461854412.pdf
    • http://novussiteyonetimi.com/uploads/file/wenirupot.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe8abc0998---rinatap.pdf
    • http://ash-graphy.com/userfiles/file/sadizi.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_off00010765.bin
e9509b889a0236e7594db717eab68650831d360d46c3699eaf3b088f49f566fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 17488 bytes
font_01_sfnt_off000135ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135AD 16792 bytes
font_02_sfnt_off00014dc4.bin
df8ae742da96cbdd93d63e88dbfe912ec39eff0c3e7b1caa012c3418c36bbd7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC4 10892 bytes

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