Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f66cc2da201605d…

MALICIOUS

PDF

81.0 KB Created: 2021-07-01 13:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8de1c26d621c1e21cb9458a5f2cdc5d6 SHA-1: 0fb39b2d2d4cb67ba6042f687cedb14a01226931 SHA-256: 9f66cc2da201605d9d4e5e2ecb9b2d9aa73d1e357277f2883c5044a41eea1f94
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://minipit.com/data/files/rimosovuj.pdf
    • http://parentini.it/userfiles/files/7227398038.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44808ceca---lumofezut.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079616d39646---44647682224.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d2cbaef0---73666982219.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/m0f1vle8anq9fdmvj2vrq9itou/zisapuwip.pdf
    • http://anandamsanyal.com/userfiles/file/kudaretibibos.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/p65hnc3fr6t0qq9kl6cpup3viv/gewelafulotego.pdf
    • http://conganbacgiang.vn/app/webroot/uploads/files/41963790454.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b62d439a---39744887820.pdf
    • https://iword.de/userfiles/file/dowoduwokubariwod.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259dc00c5---99102921036.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be32c54693d---63949336939.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f6a951cff73872577fcba21ca611280/23955334682.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/1qajr1nct0pmbfoscndouei3qf/nufaxazewukofibub.pdf
    • http://asfalon.com/__files/file/9033972790.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076628e7d74e---demakoxivalufovupipovo.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f94030da---toguju.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c4b5eaead3b9d6e2ad64bb1abd4904ce/kunaz.pdf
    • http://geose.ru/userfiles/file/54432675180.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/54c49a9238035ed67052201cfe418975/49866859667.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b5857799---23489163978.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160812649503be---1921826610.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/h28rb47kqv3van7l42f1l1746s/30665379424.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/281089363972ba3ecc5f05c425e9ab0b/jidobikajajijufuja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=part+time+work
    • 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_off0000dd2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 16792 bytes
font_01_sfnt_off0000f543.bin
fb62f9c758d5095c44d8df1e937f2ed834a6eead08f3fbf4c08bb9d09b47561d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 10132 bytes
font_02_sfnt_off00010bfb.bin
595749ff4eba80c43220ee52eb0f1176f1ceb14eef9c1303707278b12c70cb2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 16736 bytes