Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7ddb0c23c0a7d7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b6484bd57936bba4a443d077a60806a SHA-1: 4b73424c387681d2b1940be65cbfcf7ac76a7a39 SHA-256: ac7ddb0c23c0a7d739fbd88a0bf6d482e9e22abddd90acdabfbea22f8d7be184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=duolingo+plus+mod+apk PDF link annotation
    • https://casadko.fr/userfiles/file/lozolufuzigejok.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/titumamuzoleruninenir.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/dumedugexusomorupivan.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/nikikiwamaw.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/noxawiwoxasoxu.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/guzuzukikafopo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613121a376951---sigodesovivofazano.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210903074211_emss71.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/67516271828.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/mupiligudopero.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/vajemegesipupixe.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210907205459.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/49568504013.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/bezidiwub.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mnr7ipbjdbf73eg2hk7dlbesoj/pedukaregorirosuxar.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/20275955434.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/nateb.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/74559975259.pdfIn PDF document text
    • http://kd-council.com/upfile/files/sixewoze.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e7f4d3a7---22326457608.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zinebusisa.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/sewonujikusijenawikuguwek.pdfIn PDF document text
    • http://hainfelderteich.at/kopivegulowimidobivuwu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aecf10c6d6---birovefakijinejeribe.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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 17024 bytes
SHA-256: be47445a75251f32f574e360dc0e128c0b6790cbdcc18fd1994ca968eac75b39
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 10596 bytes
SHA-256: 4aafe19c3834482a94d556d9f21c36fb5d6798a920458b0aaac75cb9a980fd07

Open this report in the interactive analyzer, or submit your own file for analysis.