Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ddb5a2fd338c20…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c1672b81da4ec9fade0a6fa7f9c972e SHA-1: 371063eb21727d1a123502dc0f91d781765d252e SHA-256: 86ddb5a2fd338c20e5f4dcbb94cad844f1cf04f17b9a488225f518702abf1d2a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic to obscure malicious destinations. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a password-protected archive, a method used to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=use+adb+to+unlock+phone PDF link annotation
    • http://mlsy.cz/images/file/files/mawopopit.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/jokewawuwabeb.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/furikikev.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/98176214084.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/80919084407.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/pezudigodimad.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167313a603---56652090186.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/78769231898.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143aacb0f501---zovevewivegi.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/85247570572.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/82720984387.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/zevijenomufe.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614260644103e---69928935396.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/tivimemuxuzu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bae3e103d---kegebisolavudixofejerito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be313ba48---zagofiwiliwatafika.pdfIn PDF document text
    • https://penzion-palice.cz/content/pibabivulinagovilixisudew.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/zepadum.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/abc0e9124e744f81ff4793d2ba21f232/6429298450.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/12884691625.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/42732540408.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lidizosolajipejor.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/zazovibatimujolufisuwel.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/dijejijeluribuk.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/57003646733.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f11980d643b0aabdb2397016b359450b/naviripim.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 18708 bytes
SHA-256: 48f680444585b2955269edc68a639c00b66a8205186277f0d2a88d7e0e277ca5
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 10756 bytes
SHA-256: fe447b5c933503f50798416e91cfce6b70a63aeddd52dddb9abab36945817515

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