Malicious PDF — malware analysis report

Static analysis result for SHA-256 362aca4c586bb905…

MALICIOUS

PDF

97.2 KB Created: 2021-07-24 06:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 874c85558b8c5e1ae536ce2c290fbb66 SHA-1: b2f27a4c08114cd3a71c2bbf92f9902cc5f875e7 SHA-256: 362aca4c586bb905cccf70f653d7ca6791ddd195f0460ef9a8b45fa46be1040a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d805172d2a4---22184371179.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3ed031a02f5fb1182a8680148940a63b/50788202882.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/95963240837.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/mipojeveruwimep.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c792770056---85298565517.pdfIn PDF document text
    • http://shophouse.info/images/files/21563601838.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/57699949493.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210606051016171.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_61FBA57CF37B0A01.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/bc10e91b0a267148e4aef5621f7b5a12/jorenu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7cbb0861---jovidabufirorutatejade.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/fefodufarijetezumajikikop.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae479b2541c---13863785580.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/jagubujase.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/47ab929de9adcf37bdaec615ea844062/51064563437.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/47002367288.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/14556381520.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/07718fa7cc5cddd51d40c214d54d1b5e/mobeseduzemajosuzotubozu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf167da995---22888063857.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a402857---75898023392.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aeb9c8f053e911b2e7fe7cbe43611cdf/bisix.pdfIn PDF document text
    • http://boxethai38.com/upload/file/tetanulejawuli.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/92050196456.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/56363666258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=como+jogar+xadrez+passo+a+passo+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_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 18956 bytes
SHA-256: 1e8fd9fe246dce6ba52328f7dfc261cf19436216d89a23e6c39ba48d4253c038
font_02_sfnt_off00015b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6D 10824 bytes
SHA-256: 207721b519ebdb6555bb49655af15654730f4319bc53dc19a46fff076fca072f