Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d878929a7a125b9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 21:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4da9ffd730a469cb392781cf5df8949f SHA-1: f3e02b11c4924f217510654fa1189bdc75d46cde SHA-256: 3d878929a7a125b923ac977f8194850ec80f2c58f5ff37a5228d1cb13353f386
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially compromised or disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=moto+g6+plus+manual PDF link annotation
    • https://binarbaidequipment.com/public_html/userfiles/file/29942010263.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d0c8caf3---27717405215.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e261d8f7e6fc5c95c5ff659dc347c0a8/wuvonogilojoxina.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kufasafebetumojomopasarod.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/652b803d16342e7eebd316cdd316851a/64400866086.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/99420090137.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/4483549219.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/reredulatofilofubijimukim.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lslvlbo53krnh8l1asmvf1ld7i/77657176370.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/bosovowumaki.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/rofoliguripoxewin.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/59504862374.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/zesotolodemusepimo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/382041822f13f031a41a1e27d23cb4dc/20741417777.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1cde698b769bac8f6c3d00e563635f80/poxukepemom.pdfIn PDF document text
    • https://kawanmto.com/contents//files/19241676644.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0pli1c76mnihm09spaqtk5br16/79236332960.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/powixi.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/56985230464.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6f6675df---87842343027.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/bowataxusedogarupilisog.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b406b68c12e---lokijovagolipotanotip.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 19848 bytes
SHA-256: bda3def6735d68c9a7c80a0d16699a43c123278739b07a629445b61547e2caec
font_02_sfnt_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 10532 bytes
SHA-256: 545e8bab35002a602f68c98f5300e8edb0895fc0aaf896b8ce060fc9dcc563c7

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