Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2743ab0b1de1385…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 12:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80aeac23c3af68c2ab8321645940d929 SHA-1: b7d7738ad86f1a590d7629c0c07270406a9932d9 SHA-256: b2743ab0b1de1385a1fd94289cdb27b662c9da7bc44da5ac7e1fa2b7234ed398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to numerous disposable or compromised domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dom-2000.ru/ckfinder/userfiles/files/jovedutejipadenexiberum.pdf In PDF document text
    • http://wohntraumgmbh.at/tudovarefifatokebujazite.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/11984094063.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631224450.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75037266561.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/mobosujejulefawitusiveguk.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/matunefuluvenobevu.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/90822157362.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/jobomapezuz.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/seziletudokabivuzoloz.pdfIn PDF document text
    • https://msvadba.ru/files/file/litegonikijuduvonog.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ddb431e71b98c7ef1df56666b792d384/nelodamif.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/19896796053.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc66896d4b---sufef.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e056e7a2a---rejetisipubebogexos.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/dazadix.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/jewagokip.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/4539627282.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/vamowil.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/015878dcb0261129ba4824105b5735ee/tezakagasuguwo.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/xivim.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/ropumunurepapi.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sogaruzefujagi.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/takuvuzawusenixadajumeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=qui+est+william+marrion+branham+pdfPDF 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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 19152 bytes
SHA-256: d612067154c70a6f3d0940cb2ac39d8fa4f1cb00981941d3a943c56c63815444
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 11148 bytes
SHA-256: ae16c48ef300c8d56853f49bc12ac46c6681e599316362788f7b4670dea9377c
font_02_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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