Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcca521e351acacd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 19:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc578bb3007561ddd21c9ceaa3c90dd4 SHA-1: e203312dbbd1a43c130511a61926637b926d2ad6 SHA-256: bcca521e351acacd6beadd0fbaa1b96dfd85af704c0ca6e20879076ac9e2a3c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a campaign focused on distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2eb081c0---meripedazaxegajulupep.pdf In PDF document text
    • http://imhkayseri.com/resimler/files/wawaruviguxutozanu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/53822804659.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n77f41ob55ovr21uipo3d85g86/99728812021.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/zagigasekilidewibanapog.pdfIn PDF document text
    • https://nasikampung.info/contents//files/zunabuwedip.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/54549440794.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/47153267382.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/25703892568.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zutesenulel.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15bbe0d24---kasulebabitivupuxufa.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/17021811906.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/31bbaa33c92f67f1e3a360c69f8ca1f2/vomadixebudoroxatofavivuf.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/40680255003.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/19944421553.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d157550bea00d53cc31ea8cb3694f282/vujogeg.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/76325733333.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/ketebivusumoneded.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab71d609cd---42135632560.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3764c074471cddefef3d1f1190b36ab9/mosumenedafubogagizoji.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/751hvp07p9bju2p7r28c4skv53/numubisiza.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/57510568320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=it+is+cost+effectivePDF 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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 9932 bytes
SHA-256: 4dd549fbc11406e5b3ad96895364d52cca596d07cbc209f50cab2dd409a3d36b
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 16716 bytes
SHA-256: 3d7ee31b462c5f5c9e66a40fb62730494c15c2d516890870e07c9cc35f2726da
font_02_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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