Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bd5132fe586d72…

MALICIOUS

PDF

80.8 KB Created: 2021-09-28 01:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d524a0c361e6c5b5f985db5f6b46cf0 SHA-1: 5d54bf2b1d4069c6a3e90f0e2d36a9c9452367e2 SHA-256: d0bd5132fe586d72318aecff0af1a60a76c7326ee8ee9ee143f5a5ca4f4e350d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://daiichilogistics.com/uploads/news_file/15565718380.pdf In PDF document text
    • http://fkhd.cz/data/img/50328517741.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dofux.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210914_7CC79612DFFD496A.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lalobipedebibizurifovigax.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/37515614113.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/akeshf6ucgkg8684t91g6i3ci9/pibomovidi.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lisonuzulofifo.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/11451565188.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/40240622682.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/kifudunutowezup.pdfIn PDF document text
    • http://halanmilk.com/upload/files/fojogipuxogedadido.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/fugerurox.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/25005362349.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/pkvgh8ae65lv0ftdnvjho2980h/82127107938.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/47337437416.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/towewowu.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/21022491549.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/rakamuzavigakejome.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/jojekusogedobowiwejeruwed.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/54754608146.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/51538966732.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109271651485696.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/35853266065.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dvrjlpub84vrdul7r2ijr730n1/5678334430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+stop+amber+alerts+on+your+phonePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/zivagasepamikobika.pdfIn PDF document text
    • 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_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 10996 bytes
SHA-256: 728b9bc2e93f8a036d1188a045e08f6c8cc6656964dceed97a3a5d8394cbf43b
font_02_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 19968 bytes
SHA-256: 7b01391514837fa1208b27d44ad7f665a5591ce6b693e3188a27aa7e66e52118

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