Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ad2a5bf6d9a04a…

MALICIOUS

PDF

94.9 KB Created: 2021-07-31 09:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 18b9d839bdbbf0ffae5ae994ffa6fdb8 SHA-1: 3a47f47dbe9663a10c8f8e3def3d00d6010ad6cc SHA-256: c0ad2a5bf6d9a04af0ba8bb871c4e7bbe631a71091f7cc225c99312ca4616e8f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252c69eff6---sapusiludanoluw.pdf In PDF document text
    • http://enotecagaribaldi.it/userfiles/files/44563972121.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/97499694952.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tjf3f3n0u75uf0ev3vbf4rk709/vukugaledumewefe.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/32742431826.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/17352316519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd65e0b82---duwatoribamagefum.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/72393175656.pdfIn PDF document text
    • https://birudongker.com/contents//files/25907032984.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9e329d572630e2afcb9e9e5f76f84d8/24976953977.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/nasudubasokamaje.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/60355a45bfafc1e2eaae5297a57ffad8/53962424529.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/158820374783efe464b49485f844e9d6/25433392656.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ka8f7mvclf9hvga79h3929uir7/24143001730.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5f8ae2646803e600d89d1a2bcd9de04a/tiroxesavuzoxuse.pdfIn PDF document text
    • https://chptravel.ir/data/file/67616252268.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/mawiranufosinavebufosi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/mexag.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/59dc901a7b70845b9b9e83029842d75d/8638032880.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/j4985bmndilpab21um3n3g140u/35466267693.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577a1b1b9e---33070715873.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/55976751204.pdfIn PDF document text
    • http://santeh.md/img/files/puvajixikomaran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minions+2015+full+movie+in+hindi+download+coolmoviezPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 11276 bytes
SHA-256: b0532a23df9aa32440c229058d0dc828d2975cfa527792c2d49578ce74717839
font_01_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 18080 bytes
SHA-256: 5f3c9ceaff0842f91c8cac219d7a251f56df23e2f45fb9db0a1e73489b81e513
font_02_sfnt_off00013f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15758 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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