Malicious PDF — malware analysis report

Static analysis result for SHA-256 047a4203fb5455da…

MALICIOUS

PDF

113.6 KB Created: 2021-08-15 00:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 511ac50946d4b6f5990aacff0f762d1e SHA-1: 172d172c97962b9e2c2c8932d5b38258d294a3eb SHA-256: 047a4203fb5455da792ffc65360b91fd875ae9a486af642343de528f8a7f1012
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or exploits, suggesting an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kp433ln98tqifkbsf0l00lmij7/rabobu.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/debarejeb.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f1192146---37582992418.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qgtrheg3bf0hl6j4rb3jkcrhi3/76630791049.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/90103893212.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/95384489278.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/de898d789255a0a134736e48a9cd652f/86587000915.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/xirizigomixasonobuvom.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a850dff7---71842975680.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/16926121714.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d74184eb5b3ea9c52b2edc3af6577f3b/zesafetu.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/13842816087.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/rilesuzes.pdfIn PDF document text
    • https://businesslife.com/content/file/28635207492.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/27579818230.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-22/images/files/joxurekaju.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca583237c3---52687906009.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/52f6f9bed0f09a6a72da201de692aa76/13438935008.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad7aa64b56---kowatawelanijuzatozi.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/ladusifir.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/83486290919.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/bibatutozixudevalagat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+love+thee+sonnet+43+themePDF 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_off00015aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BC 17156 bytes
SHA-256: 587c678679c5c6802a8e9244861a9c3eb1eb363c1c8b5cbc29d6ed30f515ba05
font_02_sfnt_off00019f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F49 10644 bytes
SHA-256: 406465b04584a712088186fe2588a9dc5978bdb7597decd678ba0c05da25421d

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