Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bd291e31d86e78…

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 12:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f08eeb4139c588b48148271c89b5adbd SHA-1: 9bcc9f10ff4c76c2f5687b29453142cf4b0b0a8f SHA-256: 70bd291e31d86e7816b522a24882f28936e0a4bbb5b4ec79b5af5a74ea32d4e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=online+urdu+islamic+books+pdf PDF link annotation
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/69848373427.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/bokokuzexafuj.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/81083678909.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/2529059245.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jri5k5cveeuidt0smnm09o37o3/japogef.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/gemet.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/mevukonixivamusi.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/22352327063.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/52832869201.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/74999937341.pdfIn PDF document text
    • http://vucert.vn/uploads/files/kidosupemixoda.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdfIn PDF document text
    • http://serting.eu/userfiles/files/zunoxesawurugopa.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/67103503845.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/kolakitolirinufur.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/lasapasagamus.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fodubenigog.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bitilodupezapuxezig.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0640c11e---fikapedumidenad.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/48307194680.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161331287714db---falasuveleweki.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/vegabipomojirifijuge.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/xorij.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/wajonopizilemosukefe.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/wuvaturepelonugulekamaw.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jifanegapedubopelugoj.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/pafodetepatuxunabukula.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905110853.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 17788 bytes
SHA-256: d055d04f9768a9c85c377a5a72ec62d80c5e0cde23e962a6741cfe067a6c5247
font_02_sfnt_off000134b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 11040 bytes
SHA-256: 689b44849fd3eb039ad49a59f5ad433d715ea691cdef2244eb827b9dd13308b6

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