Malicious PDF — malware analysis report

Static analysis result for SHA-256 029a7a694cc088e0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-07 14:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72c792246479aa9b42fb95bde39e3c13 SHA-1: dbac504fb09a18dd26bb71a222314cd65ba065b6 SHA-256: 029a7a694cc088e0636b6764601bb8626a300b7f098e7ddb5fbd505dcdd90c6b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is structured as an image-only document with a clickable link, a common technique for phishing lures. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the provided `https://archism.ru/uplcv?utm_term=french+passe+compose+worksheets+printable`, which are often used to host further stages of an attack or directly phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=french+passe+compose+worksheets+printable PDF link annotation
    • http://biosurfest.com/userfiles/files/51445940385.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/29557564415.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a89179c55---96310754255.pdfIn PDF document text
    • https://eslms.com/userfiles/file/buxoxufidilezumizamigu.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kegudisakona.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c2c1724c82338ca30b239886a38c7d53/60950361604.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/57245862548.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/30222069104.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/3780944835.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ac1ca569---13512616930.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xelavudilikofidunugizazom.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/webebi.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/fixixuxafidukixiwasiz.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/50624611305.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/14615826769.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/bumijofudan.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/43114524500.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781f3aaa3b---zabalafinub.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/13do00p2a5lsocm3aejkulimi3/sutegenupusekuf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613739800fed4---babukifukururedeto.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/78529915242.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f0f25bfe081f58b15e397372fe4d3b4f/62312589880.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/13651202182.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/82939736085.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jevaluki.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fa9042d3ac16d59e6a15538d4be04a18/mijosafotowugovelutiworo.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_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 10932 bytes
SHA-256: 6dac52ba1024497b59b7d9e1ebb473f19f2ac3d1769032cd277f623dfb5d0ab5
font_02_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 14572 bytes
SHA-256: 476d05217e76f2b005f9d37d356b3cc1e1781bb7e5be1cc213c4820e4072d864

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