Malicious PDF — malware analysis report

Static analysis result for SHA-256 2100b6ac8e612e8d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 23:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5eb67a96ebaa7ab4db614caeec7d3292 SHA-1: 507c0767438392072c166f090640b69b390edde2 SHA-256: 2100b6ac8e612e8dc2727088e808970eb6ce6bd4e3e4fdbbc4d5b31f3fdc5c6c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the links suggest the document is designed to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 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 https://pistant.ru/uplcv?utm_term=how+to+change+keyboard+background+on+android PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/41043709124.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tikibis.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/xebujikobi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/67685951377.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gezubelive.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3lts5p0r38tg8v9lfj6a8qmg36/vuziwajaninofolosiki.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/5115927172.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/mikejefosid.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/77598130858.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109051056489932.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51224210326.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/jofulapilefapamorizod.pdfIn PDF document text
    • https://grnca.org/img/files/files/5840213041.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/nevajago.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pimibasusuvokumajomepiv.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/golopawi.pdfIn PDF document text
    • http://telektrans.hu/editor_up/rixifofuvodulakudota.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fb87115fa6931b930ba66254018c64b/pasexizo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/kotida.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/wegetulamutamobax.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/96507993978.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/gafibotefoderom.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196deb5d2---kaxolekazasenegumu.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_off0000ae7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7B 10956 bytes
SHA-256: 5209daa04a34dc0c1aa64650e3468b0e4e43404157104851cd061fd28e4f051a
font_01_sfnt_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 15620 bytes
SHA-256: 5fdcf9672bb58120925b022cd9b5d1be55f03f11577673279f368d3538dfdfbb

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