Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a594f38edfb579…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 15:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4aafef0197b913405819ee23d9d7cfec SHA-1: 8943943ba9aca99120ea5785e144679f4dccceda SHA-256: d3a594f38edfb5790933e24a41be70940ae0924fd9f30116b267ca09263daa5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection name imply a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://www.tzounakos-insurance.gr/ckfinder/userfiles/files/raxawisetawagajezu.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pgv07imv272old9tl7jnu2mhi0/52022828464.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/5757158183.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/50410897418.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/14885263805.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/ronomaxakirel.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/90321224171.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/gozoropurupijodupo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615383d5ba70e---30127392140.pdfIn PDF document text
    • http://ekouklid.eu/UserFiles/file/11536951432.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/68433724197.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zixap.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/38983674361.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/90528651862.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/rilizebiwulagixanivobes.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/3868157394.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/17181136784.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e248aa287fd4f74ca8e51b0accc7493/91992932042.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kabamo.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/rogunafilepiresogofanipev.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sefepevutoreramuf.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/43630013750.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/sugemavemiz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161529231163a1---74080051148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=english+placement+test+pdf+with+answer+keyPDF 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_off0000af80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 15788 bytes
SHA-256: b14a5d6deb243958b7b718c2fd585d91231f5322ce327e1ef4407f34902eb602
font_02_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 11220 bytes
SHA-256: f43aad1b3f3f789f08740fe4f6b8b666714d688064295cea992530dcd9685bc9