Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb16ae5f0e6511a7…

MALICIOUS

PDF

148.3 KB Created: 2021-10-11 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f51bd33d980ec283ae7653ccd9c61d7e SHA-1: a4b21a6998d9c3a4179ff38461e5ddfa7af4ba6a SHA-256: fb16ae5f0e6511a7ea48570859ad4d6c9608131d263b6634600eb6872e89820b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various websites, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics points to an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1615a25e11c8a8---71981450204.pdf In PDF document text
    • http://metrominicabs.com/survey/userfiles/files/15270026130.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/99771834970.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/86711937611.pdfIn PDF document text
    • http://danceaction.be/userfiles/file/63960849935.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/peliwimaneroj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689a5a0a36---98810570744.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d1cb8109ee7f4d8af78c448aef7c3ed8/zejufoxebibojiximun.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jopibuten.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/89865794328.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9a09fd915a56c14442e9e64d9986e21b/4632984055.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/fipetixisexukenupu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/xatogowubimogata.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210913_120754.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/dopotukabejazelog.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/kukevivepu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a25eda0c5---56149171207.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/93405522942.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ec7a9078987104d83c0f7256d5bea384/nibivokipubumesabekujoje.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/duloket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=justice+league+2+full+movie+freePDF 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_off0001d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9EB 21564 bytes
SHA-256: a739407ba8d5f186c245c3771491dd7d3eda8f99c5bf7eaf42f63662dc6fa9af
font_01_sfnt_off00021211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A28 10852 bytes
SHA-256: b966c52e1208a736f3c162ef84814a7c365a45aaff63b19889977258d5d198d4