Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1dd2cb51041ef…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 19:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05d143ace126dd762ec66a7b30bc5992 SHA-1: 0dd8d5c26c2c0654bb501a98f77142da537f2da3 SHA-256: 5cd1dd2cb51041efc9d793eff5e5abd953ae5450f697a7747ff0efcfeb13b137
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised or disposable. The presence of multiple external URIs and a link farm structure suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://honyi.tw/ckfinder/userfiles/file/dujilixesirulizavagas.pdf In PDF document text
    • http://top-caster.com/userfiles/file/93454222846.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/42635895844.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20504146025.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/muzabipezikipezupefufati.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ccb873454419a04ff3e91966267a3c2d/tafitixemukozinozub.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/xirakomefan.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kifazifovuxosoxatajanaxew.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/9334503434.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca98f87093---46577840528.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/69045902124.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0n962i7gpljms4s8fgrn2jsk4/wedanimepanederalenipudip.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210905111352.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/64386166303.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f83a51c30---parogata.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/wiwonadibaxomasegadu.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/lalezefoxipev.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dezak.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/kevex.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/91070502975.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/87647707173.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/52690946577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fs20+download+apkPDF 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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 19548 bytes
SHA-256: a18d20ea66c05aa8deac8a79f7e9d157d7157bc3d61d9e95ad68436501a6c472
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 10360 bytes
SHA-256: 812c11e02657dcdeef5c9a52c5427184ae2832f62bcff6057187362549ae6f51