Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c98aeb02ed55771…

MALICIOUS

PDF

93.7 KB Created: 2021-09-03 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a77b4ee431e0255b99cfb33e874ae523 SHA-1: 577bcc8bafed35222cc48f891a755f34c025247e SHA-256: 7c98aeb02ed55771966c4b6de490136799a9ea9b428931651bbe442b51316133
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for SEO manipulation, likely to host phishing pages or malware downloaders. No scripts were extracted, but the presence of external URIs and the document's structure suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3105

Heuristics 4

  • 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
  • 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=barisan+nasional+manifesto+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f676cc7e0f2---38483846392.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/faxupalejuros.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/5382268386.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/nejubi.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/tibobaf.pdfIn PDF document text
    • http://akademibt.com/resimler/files/saputosodurujap.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/5330400618.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ef952aabe104ce4c4433a1036a2a7409/powisatukozuf.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/41560832395.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216308919034.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/91728998055.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a9015120---2433934937.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/zatopotebono.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16113ded97b571---55641736053.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8d58dae3---36903468183.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/lesavulotasenif.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/17016193614.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/lupajir.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7405eeb75---22151152083.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/tomiwigapuvodesis.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/puzuwebitirowava.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/bujaw.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/vagiv.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210823192617647.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/1775772254.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 10712 bytes
SHA-256: 0cd5740d38cd6d85bdfd2777cc79942f4c117184940e3e7142e776f68a193044
font_01_sfnt_off00015e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1