Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae754200483ce5a3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 08:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 542612ba35e32e3d2642b0da65f6b7bc SHA-1: 1b750e2af1c21e88e561da7f874a4e2ecb126b96 SHA-256: ae754200483ce5a376aa94718d237400dcd602c6a8e7bd26259368942261b39d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to manipulate search engine results or distribute content through a network of disposable sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dkmmotor.com/files/userfiles/file/gawetizotogepukepubufawa.pdf In PDF document text
    • http://matchonusa.com/uploads/files/96122687945.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/15790457081.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/tufiwaloxat.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/memilo.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/tasupedel.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/zamani.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/xojemog.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/37501581141.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/webibepagopul.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/pavigagapumesi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u9apoth3agf5bpp65sr9k3lle6/xogikiz.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210911122652.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/90008276458.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/19214669381.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ue1je865kharla2as3rcne4qoq/30780086791.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/lamorufulelemevew.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/15569722853.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/jatupuveseganevobexiku.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/86772573053.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a6c0d6a---masagewivururatagi.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/tugonebaw.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/71247633275.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/fesinepejasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=brave+new+world+critical+analysis+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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 18680 bytes
SHA-256: 81ed6f19aeb3703a88a68952065feae982e42724fee8977d60e050aa8939d1a1
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 10932 bytes
SHA-256: 0757bd7f263fd12fa86cb491183efe7b3c2bfd908fde1f8991dca556d45d001f

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