Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c7675b84d19cf0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 02:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f59fdf5a023681621ac587ac55f3059a SHA-1: edeb1632a8dc989123d3424f7b192c56f822ca3a SHA-256: 12c7675b84d19cf0a406251a755a0da394b845aafd2d20fde3787340b5dd86a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://ipsaix.com/ckeditor/ckfinder/userfiles/files/mumedugut.pdf In PDF document text
    • https://es21sys.com/userfiles/file/92200974832.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2da2002e---8544172935.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/disaxivukipobotefum.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/57902250157.pdfIn PDF document text
    • http://industrialdevices.in/uploads/66989510479.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/27327916151.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/kofaduze.pdfIn PDF document text
    • https://jobtiara.com/files/files/45480601707.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/rafug.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/lisisa.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7f79lktofno39ifb01rgco2u2r/sewejinofajulew.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/16241964784.pdfIn PDF document text
    • http://dogable.de/userfiles/file/bumuxurovef.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136808d06e68---xuxadixus.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/17203212691.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6e86e8942c0bca3544948d7de2d27f34/netavikowusonagaj.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/64007284767.pdfIn PDF document text
    • https://mackbeks.com/files/file/nosaboguzu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kuzuku.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/84b9m69ggtmav3f8nact2mcfp5/ziwatel.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/sebojesidawixuwab.pdfIn PDF document text
    • http://www.siposferenc.hu/html/81480445922.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/58939572118.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/sisisuwoguzobi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/96544590208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+secret+club+that+runs+the+world+pdfPDF 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_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 14516 bytes
SHA-256: 66aa3ecf8a80bd2c6294de6ff6a6e961eea407df7275d8bd9942207a5a517d07
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 10912 bytes
SHA-256: 316b82ce4737b581175f17dbdbb5a904ae28cfee76a436c92739f7d06d4d606c
font_02_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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