Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49ced3e59ce38dc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 00:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9344568467a992ce9a65fff8b841a125 SHA-1: 81fb49c2838bbef6e96ad422acf9e2ce1e1cc74d SHA-256: a49ced3e59ce38dca97022095a990da5475b4739499da7df4ac448938fbe75cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=bonk+mary+roach+free+pdf PDF link annotation
    • http://bbfrontedelmare.com/userfiles/files/75273450265.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/aa18247b3e92cb08fe27983a8729531e/fivorowepufafapemolukar.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109011508392217.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bijivuvuruzavagor.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/37175833417.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/pizatekedizezefarerezu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/dofegebufibibefuzetitot.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/lujavosovumibelumexopiluw.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/wenoj.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/36276883372.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/81006558848.pdfIn PDF document text
    • http://cy2hand.com/userfiles/zupoganedetolonuri.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/91409509932.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/munesozodejevoxijojevenaf.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/37306702347.pdfIn PDF document text
    • http://ecole.ru/text/images/file/gitavowimiji.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/20488705488.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/83993927169.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/sabafiverowifemebigifop.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/dasotinuritopif.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vevom.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16150b92cf1ecc---feguwugaj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d2d80fd621f19cb743ceb67e93862ddf/86304062044.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/jubaxitomeduwuda.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_off0000ae93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE93 15592 bytes
SHA-256: a9d398f292407c1ca5d0bc64402ec407766f935634bcb72c49cd13d1c1b364b2
font_01_sfnt_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 10740 bytes
SHA-256: 3fa50c1d7f6f0d8d77125c4469a854f94134aa29cce993920e9e586efed32837
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1