Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0c9edba978194e…

MALICIOUS

PDF

81.7 KB Created: 2021-07-06 15:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 519b2b8e5b870a9314f28ace4780effa SHA-1: e0c4d994f9a2a1ee063519a85e9627f6970aa3b0 SHA-256: ad0c9edba978194e666c1eda91cbb0fc560459c406b875c8c84057b81376a76a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3ebc93a98bdb5e20ddffcf01ad973f69/dobaxazofiredi.pdf
    • https://asiquim.com/ckfinder/userfiles/files/fidivadixurukadawud.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11a77c067---47991760063.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68d6d3cc3---gavubeximoki.pdf
    • http://seamcc.com/UserFiles/files/wuvarijikurido.pdf
    • http://ya-ke.cn/admin/upload/38351763394.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/efa1a1b437d9c20c5c526c4f6d956fe4/lekonazepabufedogegudoze.pdf
    • http://mcutech.net/upload/2021/06/file/16236871031891185360.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fipunujerawadokak.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e65958a6---sirozo.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ae642d23546bc1476745cf5c2658463a/pekawemudubofezejosagil.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/60947b33cb9aaa867c78077f21e05ce1/66979024372.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/lilijenesojotenipafo.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089312e16e60---83002542741.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9d45088434f959374b1b07adb7bfe065/somazefu.pdf
    • http://aceonlinementors.com/userfiles/file/nawejobalafopofevogepido.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/91783243786.pdf
    • http://meteosputnik.ru/userfiles/file/gijowepuloxakin.pdf
    • https://atlastoursntravels.com/userfiles/file/rinup.pdf
    • http://arredamentoambienti.it/img/file/bireke.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160893dce4fa21---83752230610.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f585449b8b---mikadazopalegolu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=relative+clauses+b2+exercises
    • 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_off0000dc9d.bin
da11ae52d5f29802c59b76607be1eb9d2246b8305f6d32d847816b07b67ee4ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 10572 bytes
font_01_sfnt_off0000f4fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
font_02_sfnt_off00010d0e.bin
4b7f3ed7920fc9289ae169da2393de80a4ed54c845f37b30640afb707cb9a43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 16584 bytes