Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b62cd0583bf0568…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 17:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2109a31ac24356e5b90f880110b23778 SHA-1: 72270eb8766f1bcbff62963d98ffae09994c67cd SHA-256: 1b62cd0583bf05687a705538511df156ec448c35193d9f41ce8c3d81c3c4cd3f
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bharatandcompany.in/ckfinder/userfiles/files/26158854995.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e09bdc86a93121b1091a71b4cea2313d/94119566671.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386c1e5b3df---51850790869.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/69494274761.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/zejakuvuponotirazu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/rigelozosuruforotem.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/puzibowaj.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/31539167714.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/puxukepizabewapejax.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/um1dfrdt6icconmen4sb5mpu1q/dufezun.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/kujuruduxubinako.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613590400d888---pezojoxuneki.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/90695218688.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/xukerugedenafizibomug.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/60684281028.pdfIn PDF document text
    • https://novsport.com/content/File/rekonodarunegizivi.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/48289543588.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/ramukuvamuwutuviginumulu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613829b96e9f0---15068493335.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/62098651214.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/mimubiwidofu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/vutodilaladuwokidejivamex.pdfIn PDF document text
    • https://airshow-bg.com/file/lesajemudozugarimej.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/zogowuguliborinibet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=blue+is+the+warmest+color+123+full+moviePDF 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_off0000b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 11144 bytes
SHA-256: 808cdf083a3d96f389bd5eaaa8aed3f3720270d0201bcea6f1d7902ac7b50acb
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 16476 bytes
SHA-256: 7b092625497b710f4612796e0d018da38bbed061a00b4997841d9fe572318551
font_02_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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