Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a6fbc473733f15…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 06:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 435bf3372ebd6d81c743754692bc3881 SHA-1: 92b28f68e5ed6403e96d80a01839f393430880e7 SHA-256: 36a6fbc473733f15bd77069d9cb10dfc260efe213364c1213b112dd81f0622b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings suggest the document is designed to trick users into visiting these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kimdaiphatsteel.com/Images_upload/files/tapuxiwubuparuzis.pdf In PDF document text
    • https://parc-hotel.info/file/92473541743.pdfIn PDF document text
    • http://gaudi.tw/upload/files/74654677694.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/zerovusezuwotudidizapan.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613980112ebc9---rojuparesi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/79008785da79732cac6efc99ef198cf2/likuxokiwoba.pdfIn PDF document text
    • https://red-adlay.com/upload/files/98235533790.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/nasubanaselanusosovukur.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/53062344868.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/92207548115.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/82830744588.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/79742117599.pdfIn PDF document text
    • http://reopen911.info/media/file/tibarutoparejoxuberoreloj.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tefusedotubezuleti.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mukadunav.pdfIn PDF document text
    • https://kildevangen.dk/files/8931657819.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fowogukagajax.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0de72495---mujas.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sitisomopapitu.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/76385323094.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/34490139278.pdfIn PDF document text
    • http://skncn.com/u/files/20806328510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+choices+vip+mod+apkPDF 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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 10828 bytes
SHA-256: f40d214e189429fa05cf1637cfdff541a821193deb1dc60e5f5072c0c4b6652b
font_01_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 16500 bytes
SHA-256: d227a582c9076497799612f54c2c72dc708af958f900e7a8a270ad2c8c8847d2
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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