Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adc627e1f87cbda…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 06:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e145cb26440d6084ce315e698ec8401 SHA-1: 45276b0884562458552ce1320b1eb638b06c2323 SHA-256: 2adc627e1f87cbda29b6ac5e84b44304d92bff70661bdcf43107b8168b49a76a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d113766e3e---tipiv.pdf In PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/efe71986a9f26c2b487bd40134840d90/jimakel.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089e4ce57dfa---xojumererete.pdfIn PDF document text
    • https://cargobull.cz/res/file/62827520549.pdfIn PDF document text
    • https://kratky.eu/files/file/64891480800.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/82916629840.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/viwadozowonarebawasepuzab.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/4127923674.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zinifes.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/slfoh86dnqvec5gjmjb9ga59ej/83836014108.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34930173936.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b9108adfe1ff3cc06c365ee2d59a4bbc/84454387080.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/31043195496.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/74286293666.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/tpsuk2onsueqecvjm0ivud79ak/96942452085.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/1831603168.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078db8905481---xogikonupexen.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/19139325708.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4906da432d128faa27400ee06557d93b/ramokezojoliranuxisezewiz.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/veperuwamesulajutek.pdfIn PDF document text
    • http://haai.org/upload/file/debemi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f6537aa53aced05884bfaac787165aa8/2258567035.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bokog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=singly+reinforced+beam+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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 11028 bytes
SHA-256: a3b39d3a893fd8b41a7ec49706572474048933b15e8bc3fe61482ce0329e56e8
font_01_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16280 bytes
SHA-256: 439eb7a7cab237221b71df573716ef1d77752c2b4e87a3b50a973659ad76479f