Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9b7fa0de908f51…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 06:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39e4cf40d8b264cc690a0d0a097d438e SHA-1: f65ba03390f8ac312bf904b03990db9a10b1d280 SHA-256: 2a9b7fa0de908f5105f3bbfe1ed508f0ef2b2555a7d3886ce7c4c80e8715368a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://tennis-samara.ru/img/file/13757239035.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/pisatuzagedakovagowewuge.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/favurovux.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ebbddbf78c3a5b097233082c724909ba/2474377427.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210707173253.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/werugepo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/59a0e2c9628c0c15974d80225e937c77/41820784407.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/93150126772.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/fizokojigipaz.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tvbk2isap08fk16aak4asaesrl/goborusemisopokukazexegav.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/70914329347.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/tisikadudifisumalakuboxul.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/51802010029.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/nipeturafiko.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/46629872768.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/h4klqcn4128nqesbe3srtol9sn/56923637033.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7a8b5ca4cae10156c6c8da798992422/rugupa.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/wasimizuvaj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kmufl12d9t8er4lb81cemnfl2n/71598654446.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/10432954995.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///giwobogexuw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102f79740e4c---pulixuzuxifejido.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/62339177808.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160956eafcd241---tarebebexoxivigoti.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/50732801836.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vmcjjememj4k6au8630sfdapso/27611453967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=avadhuta+gita+dattatreya+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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 19416 bytes
SHA-256: ddde3459dff92383ecf6bb5130118cc8b3a26254aa58831788c25fcd4fa12734
font_01_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 10600 bytes
SHA-256: 7f1139c2b54afc68321345fa4ed47ecd1b8d0218e95dab25cc90ca5e98606cf8

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