Malicious PDF — malware analysis report

Static analysis result for SHA-256 528003375d3bf5cb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1c7f98f5fec1580154ce669c6c103e2 SHA-1: 344622b8dff176c17c43e442dcbf4e01a1fc3d59 SHA-256: 528003375d3bf5cb6c1163f7046d67a62a4a04cdeb6193028015e2ce2750285a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=mahatma+gandhi+history+in+english+pdf PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cfe0be26434bcac8f4576846711a6fea/wunetobewesikezuw.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/visukizitifovugajak.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/80627843056.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/24340827251.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/17559368939.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/92170306067.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109110043515304.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wisekotim.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/jadajaninuzilijupe.pdfIn PDF document text
    • http://haai.org/upload/file/58828250597.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423778c8235---zajixewam.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/84465651212.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_121356_592.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/69433703876.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64549724358.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/42450297986.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/71846064680.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/nosojevixowisasog.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/mopim.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/gefikomapi.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/21793701542.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee08c637a0---41185020778.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/godubilefokerizij.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/roxinofazusonemad.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 11052 bytes
SHA-256: 02b0f72eb02debf38131c9916f284ba71749fd58364e90bc725cbc80593c2126
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 16880 bytes
SHA-256: 701903ce8e4632d3b913e4c0154e3cb2033bf5daf45043a4f4b48cccbb1d931f
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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