Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebbb3f2b936f2d3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 17:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 009a51ca1981688d4f08ac8c823816ca SHA-1: b128df61224bfd3e9281540752c3487ca9ee5fc4 SHA-256: bebbb3f2b936f2d35a91744209d4e73bba9a326994a76214430e1fda8312fb90
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, with a high-confidence heuristic identifying a link to compromised WordPress upload storage at http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1isagbs0r435r0dnvpftcgbj63/surimowamolatapiw.pdf. This suggests the document is part of a phishing or malware distribution campaign, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://weishinclinic.com/uploads/files/202109042157176706.pdf In PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/gebalapewifegofovodebi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q28n5hn7lodhqet6mgreh0mjo3/1388724051.pdfIn PDF document text
    • https://tckontrola.hr/files/97118570724.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/japezizupotutefasurada.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/32546142720.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/79554232645.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b115ac800b---muwivi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1isagbs0r435r0dnvpftcgbj63/surimowamolatapiw.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jiwezo.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/51257723321.pdfIn PDF document text
    • https://cargotavio.ru/files/file/monaravo.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/nuturikugedimel.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/50519300212.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wizaxuwewuribatosen.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/90761674258.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/kekujiluzoreranovekutotum.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/21498426706.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/56400245232.pdfIn PDF document text
    • https://norservis.com/files/files/roxilagirogebitanerasuxa.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/8116913341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=england+west+indies+live+streamingPDF 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 17572 bytes
SHA-256: 2823394ab6618aeee7006ee77b467c94a95b16dc09821d7f92a201719896da6a
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 10608 bytes
SHA-256: 2d89ed2dab08501a0f815d996d8a351d62c906118ffb3ad69e5119e8d1d6ca4c

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