Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb75ac0aa1b77842…

MALICIOUS

PDF

104.2 KB Created: 2021-07-03 18:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45ceb5002ff8e60fdd49702b2d09e44c SHA-1: 3400c80ec53d8ed53a72e66e881dc34b79e524ae SHA-256: bb75ac0aa1b778426bd5d30f4081471dd8e3271ca78864270f1709452fc2ed38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links are likely used to lure victims into phishing scams or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=meaning+of+set+aside+in+law PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/59e1017e500daae607a4682dfc96923b/37880752539.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/574de93d3c103bad547dd1068a779a18/duwefimelanusupulunasufas.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zonutiboviso.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087844ea88c8---lafemelubiluzikuzumixo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c6aa8df52---91589344686.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/59198131470.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92c533dbb---5056217329.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/ropiruli.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210531025937.pdfIn PDF document text
    • https://securitydm.com/slicice/file/tiwet.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf50d46dddd---werorevanuwonubet.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/5416604748.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/8941248167.pdfIn PDF document text
    • http://expresskaliski.info/file/sikuselij.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wakofule.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/jelorepuzipivobom.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/i4eqn6o1ie8gvobbe9hbkqtsu8/nufegepivafifetudopobab.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5999fa031b3b5a0bd77239f214ae2ae9/gibijopoparisefajutogab.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ep461nrgj5683tqhvtt8s67pe2/zaxixiseb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3919f1c93---xesilewosuzawafofatijedep.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0aca66737---96787796725.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2690988---78857398752.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904160bbe7c---52366840218.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_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 10508 bytes
SHA-256: e863c74530e1e6909bf237c3563a65b815a659463edf1c654b0ef9f5464bafb0
font_01_sfnt_off00014a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A97 18792 bytes
SHA-256: 3a3076a217d7ca7d3308d76eae85d26ffb9321f4f5736d26717aaa867d27cb04
font_02_sfnt_off00017b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1