Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b0fd86964d2567…

MALICIOUS

PDF

88.8 KB Created: 2021-08-16 14:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e13ed4c8013be0feb89fc280179c2eb8 SHA-1: 52ba34fdd6f9c7f227d88417282f0c6e50b2e9bf SHA-256: f1b0fd86964d256763e734464b17b053761e98f0cd92071e7939c6f7c1acefc4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack where the document instructs the user to execute a command, likely to download and run a secondary payload. Numerous URLs pointing to potentially compromised websites or disposable hosting were extracted, suggesting a link farm or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://alliance-ic.ru/uploads/file/41574572009.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37da5ce0b7---55011559775.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fe133c4385b---13450343536.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/gomavijubomule.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d541de4425---dotumodavogej.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4a5e73077a609d10cd97257e3164d7e9/gekuwivilofivatasa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111725b4abc7---nikaxuwonasogumijik.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4cdd8d0a6dc9fba9449f77f88a4cf96f/42440497916.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e07b38b7ae01d233c2678023b2742163/fozedodefug.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/06b4e65507a058140a6177bd544d0250/64033922598.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4ba93571---xugalebudigaxis.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pajavavegapesadobibade.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ic1u4iniqhrl9m688gioneg527/83713832478.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b5bdbce50a264f81b43683b813697c4/suwusirizike.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/82444892595.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/rumuwumofuwivilodev.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/061a042a06dd145f720c22508a9182a3/pamawotitunomo.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/bajufon.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adf62fc78f7---18799190392.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/87643698580.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dikidelowam.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vufoliwibalujusuvo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608668907e49a---2057454007.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ruromanajumezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=magicite+ore+minecraft+downloadPDF link annotation
    • 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_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10728 bytes
SHA-256: 38f86d8d65363c17a10a49908e9727fdfd92ad17b528d5bfd7ce5d8e18ac170c
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 17656 bytes
SHA-256: 3854b3dfeab29d163136c209eba8a940abcdf6556675108407729e1fce69a6d5