Malicious PDF — malware analysis report

Static analysis result for SHA-256 629769d8230888cd…

MALICIOUS

PDF

87.1 KB Created: 2021-06-23 05:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 78a6f76de894bbb7ac5200c02f2bca59 SHA-1: c9cc9e1a99544e213c51e9b626903099c4a48f3d SHA-256: 629769d8230888cd070a28982dd16d7c33c9b75b6071ac87b4634658864ca33d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing attempt disguised as a question paper download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd29cd0414---85209425411.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/44d83bcbba34508b87a06d434e4a3693/jonizufomorisutofexe.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d5dc4b1e12396c943f44d42085827bc1/56275373174.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/71844268582.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/0eb8d8c9f717f05594f5b1813cb29806/54534412798.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd760e5156---92162498462.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kl4fi51s2m6hvbmgcgh5kqvt9u/muxopoluwori.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/xarebuguwijezuwalub.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a158672e8f1c6c137b596770a1fba04/ramajoxujeja.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/32324630671.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d800b58---sonalipepukuzepalutu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/61670111597.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/46870007984.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8259ee14337f2866f6d18115cd969af6/7933634995.pdfIn PDF document text
    • http://k-barrierfree.com/FileData/ckfinder/files/20210620_C07AAB910C70C03F.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=si+question+paper+2019+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 5836 bytes
SHA-256: fd822e1de7e06fd9486c2c01d725e02199e27eceaf3ae87413081ac683a5c1cb
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 11024 bytes
SHA-256: 4570c8be557476d49eca43e70e45a3ae48db1061901605f3fa5e8498dfe60312
font_03_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 9040 bytes
SHA-256: 69c400ff8bd4c269ea5cd015b08aed3ac9321bf8721e04afe06ee97b945c0a2a

Open this report in the interactive analyzer, or submit your own file for analysis.