Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a55df0c74be05a…

MALICIOUS

PDF

115.1 KB Created: 2021-07-18 19:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4903f846472e19c78131bcecb51182a SHA-1: 5200fc4d26f576d3e2c86760263f69b2ef4fa956 SHA-256: 87a55df0c74be05a643a4b9eaaa4b2a2386f4b880c54975b18b0c9faf4d2641c
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS uploads, 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 delivery. The presence of multiple unknown URLs points to a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecba7b8b7---semejewibemixosidi.pdf
    • http://omegapizza.net/uploads/files/93428265443.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6fd368f81afe89217920d3d25dd75453/29329381067.pdf
    • http://nfc.soo.jp/file/ladufoxibujeweroze.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97731a15f2---21044231555.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b40be7644dc04f280cdfa395f8dac1d7/60315652689.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/4511094009.pdf
    • http://msslink.ru/userfiles/files/57587740894.pdf
    • http://inlygiaylynhua.com/upload/files/tomobasudemifi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1addad31---tedeleworamerotef.pdf
    • https://bistakalikotenetwork.com/userfiles/file/57432963851.pdf
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/15966698097.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af7881069d7---14020398171.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608514df38af0---xatemevofunodagujixifir.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b756635b2---59980722788.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5450ab189471a83f965db7d88a7161d8/55281350536.pdf
    • http://creativetechno.in/userfiles/file/kuweba.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b414b098798---74299947325.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bo3to68m69a0jlpvjathjqtpi5/dititobew.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d213d6e22d5---7048108367.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/07fafaaa0a709682e32ca3cb17ccb4dc/jigupu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bth5g86dd2eufts9rl06810dv0/pusamirizusapilinevuwa.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ca3c04b1236161737e2fcedabdffa1e9/bajusefe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=high+eosinophils+after+chemotherapy
    • 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_off00015fcc.bin
8a064b8d90f95a03fec0c2ef2cff9e32056e4f2bbbcc56989f669807d602e881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCC 17688 bytes
font_01_sfnt_off00018d85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D85 16792 bytes
font_02_sfnt_off0001a59c.bin
4795979a232850a4317e6168cfd3c1884b2b1c4957a22d95a3fe9ae44543fde6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A59C 11032 bytes

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