Malicious PDF — malware analysis report

Static analysis result for SHA-256 100b59d7ae44934e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 17:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddf70b02f60db9cbed69982af8f9d5e1 SHA-1: 152bafbeacac2961dfe36162d7151365fe8461a6 SHA-256: 100b59d7ae44934e600e6e6313cede4336bafa493b4aec759b4c1855b163b75b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection, indicating a phishing and potential trojan threat. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary lure impersonates Microsoft to trick users into clicking a link for "office premium android", which likely leads to credential theft or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://drafthe.ru/uplcv?utm_term=office+premium+android.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=office+premium+android PDF link annotation
    • http://inspiredindianfoundation.org/uploads/ronerononovinovigod.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/14507027380.pdfIn PDF document text
    • http://chinalabware.es/d/files/81869720594.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/patusago.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369089c4d41---23700901592.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210905094919.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/79026633783.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/28985167435.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2bcd71fc---waboxugofas.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/nulojusepiza.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/15544329053.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/39gqvdblk6au7152ev35dl7adn/43917469037.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/66903086621.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/bugokim.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tefusasasatuwi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nadazosanesusumulo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/wojekipojinonawim.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/89134248783.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zebaganeperasoma.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/79632417914.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613688e4a08aa---27015750960.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jonevivanivotatiwewilig.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/losib.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_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 19768 bytes
SHA-256: 9ff749bcc1e88c826cf9178f4b7995e3a46b546137da98d2655adc1c11d441a6
font_01_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14758 10592 bytes
SHA-256: 288486b5139855d21a5d76201d50e39a93acdee9f63f394173a3c6a9e18aea05

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