Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b360e88fe6eb1f7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 15:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5e4b58f1540a520bab37fd8d7c43593 SHA-1: 38558b485c621f49cfa945647a2c1ccb5ddef202 SHA-256: 6b360e88fe6eb1f7abecded2619d1988d8ab09db92d93db67206e3ee91cff7db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS upload directories. The embedded links are likely part of a phishing or malware distribution scheme, aiming to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=sources+of+law+in+malaysia+pdf PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/628c5bede109af42a95111584106a0f9/bekedabuwejibaweviguxiv.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/76387264846.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8mu21dumbrqe48tq5t8gngvi55/72231545187.pdfIn PDF document text
    • https://ebooksweb.net/files/file/8844630628.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/wexitarotijipawas.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ee16d19b---20818846449.pdfIn PDF document text
    • https://ovalpolycoats.com/media/pesazidajaseb.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ca96efa0a6b0340cff096bbf89dcb5d7/70508264056.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/dajewakopu.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/46279635618.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/wubalalutar.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/62884764552.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79f51937---xataviridilit.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/42195210685.pdfIn PDF document text
    • http://huiking.cn/uploads/file/180351176446.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/ludimaduf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609feccf87207---bikeka.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/revevevo.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/wulepekukowikudu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xirabefomivigebitaxupe.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/38237502064.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/iofeu4estr17ki1f3c7m486urp/15513719158.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/fefegurunepemerofejojafix.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/xozada.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jumudutotiwekakob.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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 17940 bytes
SHA-256: bd1178f7281bead680a714bd4d15967a73663a32cc3e25414a7988906551fce1
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 11056 bytes
SHA-256: 150df52b9bea5fa1a48174227f8d8a25dfec9cc017b45cd25f08946ce92cab85
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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