Malicious PDF — malware analysis report

Static analysis result for SHA-256 998c6388d25913b9…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 16:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56ed469e70b8dc4d2245f1de718efe2f SHA-1: 8a96ebd2d49eee91910a74f8ba6f2885f45f78cc SHA-256: 998c6388d25913b9940e011c9b07a7ef696b02aa7e2ed4c909d9414f83e7069e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098f02acfe9f---zofanogozapomew.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/49evjuon29i4hq03bvq6mdprbi/wodebi.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/thtnve5lt7fe2q6er4lqr0iec3/65010080375.pdf
    • http://elsekmont.eu/userfiles/file/mikegumorezepaxuwaruxape.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a6396e9d---birazorapezogar.pdf
    • http://sotel-perm.ru/site/file/wusokifamepu.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/38946412903.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4635cf3e---96312259204.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/9434107345.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8ie5etq3js8cspglv8chjmp6j5/xutorofonubalesad.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9bcf03081ad9b92c11c37bddb0524ad1/79602600457.pdf
    • http://spreewaldatelier.de/img/editor/file/95261303184.pdf
    • http://staropolski.net/Upload/file/66275938853.pdf
    • http://codienlanhminhquang.com/upload/files/19470224682.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeg97vi2fv3bjiu3toffdoq3k2/27845694749.pdf
    • https://henklinders.nl/henklinders/upload/files/kafirevulitigataxate.pdf
    • http://canxetaidientu.com/images/file/99232533811.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4efdee6c---kexobowugipakixerefera.pdf
    • http://dhf-china.com/d/files/mumitovekasabupukuzojaxa.pdf
    • https://gilbertems.com/videos/file/jowedesolenumetuzalarefu.pdf
    • https://makojudo.pl/zdjecia/fck/file/91575754135.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d65f6bcfc0815b6f5780b57de5f09c36/baduxikegamuwaduruz.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075786475a69---52889753632.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=angle+puzzle+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b9.bin
185bb99318aa68367a222486ae411afb7005af8605a141985bd8fe067bf10b00
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17504 bytes
font_01_sfnt_off00011f86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16792 bytes
font_02_sfnt_off0001379d.bin
2a93c220d71252f940b6892a041080d990f7c5706f712575e73e7e868983c9aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1379D 10760 bytes