Malicious PDF — malware analysis report

Static analysis result for SHA-256 153c28343fb9d230…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 13:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d4774ce36476cd8370128196bbe7ac7 SHA-1: 197a9b426747579d5e562a87f28fa73106d1868c SHA-256: 153c28343fb9d23085e66307a3886f02ab3cf547f92132bbf6de21a4c738fec3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=not+receiving+group+messages+iphone
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5686de8d5a2b4291018a2c6ff4011717/3439491652.pdf
    • http://rydelko.pl/userfiles/file/tekenajemudavidatapeto.pdf
    • https://apsco.ly/userfiles/files/zoxeluza.pdf
    • http://rund-sro.cz/UserFiles/File/bewugetosatebareroxijum.pdf
    • http://cisseo.net/userfiles/files/55589852641.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/74696408438.pdf
    • http://work4shop.cz/userfiles/file/visuvubudegi.pdf
    • http://recuva.kr/upload/fck_img/1630654342/file/11846017370.pdf
    • http://law885995.com/upload/fckimages/file/43707641372.pdf
    • https://sharenkon.com/files/71919314575.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/vobaxoxer.pdf
    • http://tuzvedo.hu/elemek/file/sifiwazudugitasuvax.pdf
    • https://ltes.tw-goods.com/UserFiles/files/81818433751.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d7771314a8c59c1663ec96a50d8fc4f8/95947009474.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6dabd4d88---84645874173.pdf
    • http://cichanski.com/Upload/file/batemi.pdf
    • http://trieuduong.com/images/Download/18850122669.pdf
    • https://dollarplus98.com/images/upload/files/xasowuziduvogotovojelenag.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210905_37B6C2A09F48DEA2.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/67ce55d36bqh7unuh8ab1dastt/kigamo.pdf
    • http://suamanhinhlcd.net/userfiles/file/967412157.pdf
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/bavinomot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00b.bin
15f1c63c09ebee7b01bfb0d279537a633e3ff30aa752ae8dc2400fb0f580d4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 10920 bytes
font_01_sfnt_off0000e931.bin
3e93fbaafa21a94a90af989d0e05d35db0541c02864c85f5224137eaba60a2ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16788 bytes
font_02_sfnt_off0001155a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes

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