Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4089299c80fb118…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 06:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb7e1bfcc5985501e040a83d051ed66d SHA-1: f1ca079a0b0b48722fc9f77047cd8212bb96f67d SHA-256: e4089299c80fb118ada555627830ef686de7a4b7a8c2ef355c0f4cc3fc5b0416
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 file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=social+commerce+2018+pdf PDF link annotation
    • https://personnelcle.com/userfiles/file/30489132648.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c0be3ddcc10be646c0d594c71e3bc195/xanujeguviwolasemav.pdfIn PDF document text
    • https://tigapilar.com/upload/files/97683638559.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/24336440342.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c2qpoj3180eo0h2kjkabbmobkc/77152083161.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/37ktu5adg342jti9dt1b2fmrf6/vudomaros.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ohgqg3tllqo139blkghobhe7b0/67286118940.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jojovir.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/7mjhb69ho98ngpbilvl8ig11tp/43229803688.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af99eb7efa1---wilemeserafuvamimabu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/47681014882.pdfIn PDF document text
    • http://emeat.ru/var/files/80067370190.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xibominiwogi.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/36699921153.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aad6ed292fe---37335692679.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/69729307247.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/75774041081.pdfIn PDF document text
    • https://jotelek.hu/files/file/lamidetesozefogusitu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a08921d45---19942412027.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///82109107579.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/7880134050.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f80d6e5a2---85841258248.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ebc3f7ff83f12774eeda070977e9130e/71108181197.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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 10988 bytes
SHA-256: dce08040cde863386d2bb757f12d76dfa0f687467bd5043306c7be620b847d80
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 17164 bytes
SHA-256: f3e8253b2be9e2d0e4e45c4383d2dee428f9e47f664b393da19671cbab99b53e
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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