Malicious PDF — malware analysis report

Static analysis result for SHA-256 754a8fd93a78113d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 18:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e18ace6b7d92fee80e459b0805ec5ce SHA-1: 51c13c07775f8ab10c58a2083d19f66497c10621 SHA-256: 754a8fd93a78113ded1ab1a426c1ac7ef46c88595bb501ef2e38744b11de4473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. This suggests an attempt to distribute malicious content or conduct phishing operations.

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffed02dcd---pefunu.pdf In PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/46998407800.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/94884997225.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/dawepanida.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wajoxokezizevibewavare.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/62229877830.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/46968913383.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/nenelibejobejerazoxekit.pdfIn PDF document text
    • http://chromavials.com/d/files/59284760868.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/wisijuri.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402ff169141---33416222522.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gimedoxixe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb47b1695---35813671533.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/33404466419.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dezak.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091104282491.pdfIn PDF document text
    • https://eetravel.net/file/jikazaxelapajiwif.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210911050449_o5kbie.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/92892936345.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fe915b54---94691585491.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902103512.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/40653231742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=new+year+live+wallpaperPDF 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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 17988 bytes
SHA-256: 2c55fb3b6cf0650f7f21560db492baac8e06102e50547844e55520862174ba53
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 10000 bytes
SHA-256: a35f4fc34f1d37e42c333ecda6969816864c5740bcce1ae3e9bab03ec9e540bf