Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03afa0065920de1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 00:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6933cfd523e154a6b19be0f41abe769 SHA-1: 33d9f9f31fcd8b281832af84e4841a9b72e5eef4 SHA-256: c03afa0065920de1e1d7c234c7fbcaa71afdccfc1725a1dc833929ed04e70f37
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, including links to compromised CMS uploads and link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=nfs+payback+for+android PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb4a866d6---84190728945.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/ranufamo.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/49214269669.pdfIn PDF document text
    • http://irths.com/upload_files/files/88017619109.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/14687494665.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904200121.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/73b8f7d32e672c507279c6967bfbac2b/tudebi.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/febil.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/81714206277.pdfIn PDF document text
    • http://pmke.cz/pictures/files/tenaxupefefazebuti.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vegikatevesuf.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/050dc9ced68da534e03ca4e054efd9de/53685421249.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///64814952852.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39488925053.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/ladirowimabono.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/15778072964.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/90156376971.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zemekebidilabenazifekifa.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/patodekexenarativ.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/49544868093.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/bilulodawuxurubago.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/nadikesegaripaluvorir.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb144d8f2530b84883b728feb5683a7e/17944111476.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/tebazuwagupajiten.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_211210_634.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_off0000b6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 15284 bytes
SHA-256: a079a931d798aff070b8b5945f3bd17a535b5cdaf23c60cdc545c4829b879dde
font_02_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10660 bytes
SHA-256: 48760308aff398ccaed806cf38feeb8f780207edf3d0d2c0f9ae8020df5fea39

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