Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9fd392da51c7fa…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 08:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28b181ae499f2088a12087d8d86858c5 SHA-1: aa4034cdc67bb18465b05be47384def12de0d39d SHA-256: 0c9fd392da51c7fa9530ebd79003c7869709b05e49fc9d81997074738d050652
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=five+run+away+together+pdf PDF link annotation
    • http://qianlong99.org/ckfinder/userfiles/files/74342412730.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/11190190391.pdfIn PDF document text
    • http://precisao.net/files/files/refakar.pdfIn PDF document text
    • http://full814.com/upload/files/21002015202.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/lijefaxetonarosoloxi.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/15434251018.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42450899702.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/tewase.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132629a356b1---55019254549.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b535abe1---mufej.pdfIn PDF document text
    • https://grnca.org/img/files/files/5840213041.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/89432411046.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/72361379664.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/7855362769.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/83132544552.pdfIn PDF document text
    • http://robedecreateur.com/img/files/71798116344.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sijugufelugediruluw.pdfIn PDF document text
    • https://norservis.cz/files/files/tilegudevezagovuwegisev.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/loxefepakexuvosu.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/73945091435.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/88262071557.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/37607632775.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jodigizakepi.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/kediduxiwib.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcf77ecdc---84097701313.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/mogufapogubopom.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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 17636 bytes
SHA-256: 1d21ffe4fa80bba57aebc455f140f1f634de0a80391dc340e1e10094b0c83283
font_01_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 10904 bytes
SHA-256: 2645a67e8cde5ff37afad55f5ec0e334669980a7646c28a6cd0e33e46cc1ac61

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