Malicious PDF — malware analysis report

Static analysis result for SHA-256 c196df07edf63c22…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 06:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78ae9e9b8e701719ff83da07ffb07386 SHA-1: b9a8cd38b18c21aaf6de159895d75b1233f852ac SHA-256: c196df07edf63c22fd987ae78b627b800fd7549eabf4d537ea5f93fa1b6ee501
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The presence of a 'Download' button lure and the ML classifier flagging this PDF as malicious strongly suggest an attempt to trick the user into downloading a secondary payload. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marcth.pl/media/fck/file/vijixabox.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dc939192d601c35d9d6447fb94823040/nibulojejelamurowasavod.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/3813992312.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6a9ce7ba---vazipibosulunalo.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nugilusadimixefexavun.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tetemirolibe.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/suqq9fgfs28kmncsklcuhad1s1/33018927558.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/wavuwezilavogom.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796af57d86e---76847302044.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/61921356506.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/gibesetejivaxirizu.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/petariluzubawigugapemuso.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7dc6c6785---73335332426.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608465178f240---50537276547.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d984qqs84d84a48ajcn5ao27j6/panosapixazuvevavekeka.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/7761105028.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8eaf9e131---xarobufopokumuruzejeti.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/tagudavowuzuninawukabol.pdfIn PDF document text
    • http://tw-go.org/files/sowexaxoxomuge.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134e0cd73e7---xusot.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/33686183558.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kexinurozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tamilrockers+appa+hd+movie+downloadPDF 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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 17040 bytes
SHA-256: 4438be549185aa33142995d7736c94b80abb1cf266052bf0c79163084cbc29bf
font_01_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 10888 bytes
SHA-256: 8cbcc70a7c4c8470c7e4d02eeb5e3ce1ee0a61518eb2856a3ddadd9281e41cdd
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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