Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35e2a005902cb56…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 04:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 786e2b963c452f725f1462ce6a91e99a SHA-1: 1e99f8bfc5f8e6403b7d939d6247a9bd66d10a06 SHA-256: c35e2a005902cb5697beb3718696743df334127eed828305cca69144bb5bd5fd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://apsencollege.org/test/fckeditor/file/xomuvivodusireg.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f20872953a8---13303586766.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/felig.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bffedf38b9---73793593845.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ospe60ackg5aimjulnchojc4rd/22632969512.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fazipoluberilis.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ec5a5d22---gudorunogete.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e7fe790883e25a7c40bd92a53a74c828/mobifuzuxumiw.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/28979ad0dbfcc3aa4b26fc2b0db4df0d/vozexuzanefawuwunuvor.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/gixaz.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/develuvevurekozegupapezu.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/69738548762.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o5j58ar7vatcqi01fuvjtfmgv0/16961005218.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/tudevusasedufise.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/tokafogikobezusamepetuvaf.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/328826d88267a0ecab88f94ac4594988/57266611738.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c67f6741e---nibixulotifuwowuki.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/leniguk.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/27854051200.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/40419884072.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/buvelo.pdfIn PDF document text
    • https://nicosiacaffe.it/file/62353614072.pdfIn PDF document text
    • http://dzbnf.com/upload/file///17801815521.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/46570375671.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bku527g2f93mloikha880hb6p/78672628907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=trust+and+obey+hymn+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_off0000be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE21 10944 bytes
SHA-256: 5da493a858890fd8648e1b66a896b283b40e2cc2c03b55e31dae2f0f350503cb
font_01_sfnt_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 16252 bytes
SHA-256: d290a453691dae1e40c1ede70dc18280245b65333595185d86d423a234762ba1
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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