Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5caa7dd973a245…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a484d27dc3b155be4171984d65825e7c SHA-1: 1eda1491d3b05868f92a704925dcb44f95d485d4 SHA-256: 7a5caa7dd973a245453fa7f8b6abfef386f3f15287c9f1f815d0562445a68287
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e04f1a00---xizariwime.pdf In PDF document text
    • http://mppscstudy.com/admin/usercontent/file/lufabexovesawis.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/93888360138.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837ac09bb4b---wemelalasoj.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/lalazexebudokidotog.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589964fc71---gubifaderenir.pdfIn PDF document text
    • http://93564497.com/userfiles/vojij.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b55bae35c57b71a9ac5b51c18a7fc156/54899634994.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9990ea2e---68092451211.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609072b195c0a---24954899650.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210715_23D4FF0B7F4752E6.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612179d0375af---vepiwaku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u55sf421dk74dt56qq5qsu2c1h/22471917614.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160814e6289156---39912605628.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/jamiriwerumumitogubume.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c51952481b7---55878282421.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/69475383154.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/52247598734.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078121e3b38a---99184190593.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/86853725589.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/xufataxutuna.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1fd0f02561d36523ae0f5013a712eb33/risolafujotumat.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/lajanalifugotikomedenup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=text+to+plain+textPDF 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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 17776 bytes
SHA-256: 22ca3f074693707f280d21ade43f4bb935872856913753b4a856d31320e26327
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 10044 bytes
SHA-256: 24e21d45f41ff368dd1d1c26d042f9c861c3f94c3bc4c26dc38103eb6cf7c236
font_02_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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