Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be4dfd82945658d…

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 20:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ddce85a5276e72c20586b4910bcc7b6 SHA-1: 3866e0c369d41490a44a411842ca02e18433924a SHA-256: 1be4dfd82945658dbd73f36c7f10fd2885d48e6088833e8b4ad8205321c0b889
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised WordPress upload links suggests a tactic to host malicious content on seemingly legitimate but compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r15ag264dhinkvm0o5360tlls5/24020787786.pdf In PDF document text
    • http://okulsanmalatya.com/imgup/file/zajobilediwajomaz.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/wixexekutolimekozir.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5euf3q135qjs9itjqfd3hi9aoq/80408903127.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a9d74560---78496946528.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/85078111266.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/21019126937.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zupanal.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861f4c4eca8---tofoxarusodoparam.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/85529199116.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210528090856.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/83582050845.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607351d281b1d---8897176001.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/58475984102.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/eec53e7e2f15000304a98d502dee3b57/xesokeximu.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/bomovasavawomudino.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be58b21b166---zepumaludib.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a71f44a0e0a4db20d63ac0a8318e8e9d/67074341975.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4c8e1e9f---25093501733.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/63845279638.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d750e4e3901---nuxupejobakepire.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/15958104231.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/43cfef7d916faa26c11279774df1aeb4/97310620975.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/weridenaxozorejuzuno.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084844e7beff---78730925981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=when+do+you+write+to+whom+it+may+concernPDF 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_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10712 bytes
SHA-256: 7e2d94737c01954fb2000c8990f7b4293d66d909b13c21d1d8e750daf3c9c55b
font_01_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 18144 bytes
SHA-256: 9c8419839f67e7d80d055dc3bac9239190f4eb6b1d19f41f79ed7ec95dfd096a
font_02_sfnt_off00015a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1