Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca08b19ff6f0a53…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 13:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edd63b965ac088f3997b85a8f22b41ca SHA-1: 9293d1e5f532b49851401da6665fe10a4511daa1 SHA-256: 3ca08b19ff6f0a53727c4f31fdd435da6f7ae727940ee287e41d774f1263f815
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including links to compromised CMS uploads and a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://garglob.ru/uplcv?utm_term=adventure+time+run+mod+apk PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/52948118896.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/jokubujubo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142daafbcacd---tuwawubivu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tiboketi.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/64215141301.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/xixorijevoneboloki.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/gadov.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/25615962113.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/xurebafugut.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/51874936034.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/190008031467.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84c160e84---38305710042.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/34355107761.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///49449019282.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wepavaxuzozupak.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kiniv.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kuwaseziwuvu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/rimosozibanewepu.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/zananekukoboxazomigojamo.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/nitutaxuseselakali.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://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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10580 bytes
SHA-256: c5b3aca10dcabbaa81bbd6a36c1d0cbe69d8a8ff43e42e11e5576f442dd1b1d0
font_02_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 20192 bytes
SHA-256: 5670f1f216b148f8e6a56ad6061ce6201c5caee593e1a69a8d39a585c6cf79f8