Malicious PDF — malware analysis report

Static analysis result for SHA-256 d179f4839c22a6a0…

MALICIOUS

PDF

128.2 KB Created: 2021-09-05 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b846c9f6e38f699bf7102b32b65f3f0 SHA-1: 465f2e1f88c0cacebf38afca8a61d2e2b7e49862 SHA-256: d179f4839c22a6a029efe35ade7214477a454702053b9502af0ee42debea5ff6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c86599262e5---burulepurinosela.pdf In PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/78428219717.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608848570eacd---16828389630.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/tuxoparupawala.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68d68c0eb---jirikefamegexelanijesoxu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/bc923322387223e5d9df9316bcd1b1c3/90291892140.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/bvmqkkv43ef99gbim9ouabg0cl/paxalivu.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/89149115605.pdfIn PDF document text
    • https://okazionche.com/files/vaverodasafowi.pdfIn PDF document text
    • http://langmypham.com/luutru/files/9392348110.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/tikenanaj.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2a456d747---29496589486.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/mivorazuxobaxivixefeka.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/54324404462.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/60c6232d6730a184045f55c942c16b58/votunufejagi.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/87291950626.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fukajatuj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9355e1149c---26716754203.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf98c0df15---97132880146.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabd5fb8036---mepirebuboziribut.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wivajezugexowomeluv.pdfIn PDF document text
    • http://dges.in/userfiles/file/xoxerimasinugiwedibuzenu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v0o4pctqg700bhophs60dmceh6/44874027924.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/51008501852.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f3471cdd---nagabuwesebug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=grohe+blue+professional+installationsanleitung+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_off00018b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4F 11056 bytes
SHA-256: 598b86a0827411241b465bed409bf61ceceeb5a64d15786990e172f600c67990
font_01_sfnt_off0001a48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCA0 20500 bytes
SHA-256: e2dd3d0c90a5cb3d24c18a6db8ef7eabcedb30f5cd18e6860bacb9a7d6e7ad8e

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