Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74c2856a3fa2b66…

MALICIOUS

PDF

100.6 KB Created: 2021-08-19 20:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ef87beaa7885d81f0578cad242b189ac SHA-1: 353aa4884d9970033c8e6d23cd260b0dfb57a529 SHA-256: e74c2856a3fa2b661e7641d1864e55c5b5785afe2a6b849896497e56f7d5409e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, directing users to numerous external URLs. Many of these URLs point to compromised WordPress sites or disposable domains, indicating a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://smidgel.ru/uplcv?utm_term=clawhammer+banjo+for+the+complete+ignoramus+pdf PDF link annotation
    • https://srmresidences.com/images/bulk_images/files/17954327680.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a3cba5201a8a4f1818ace2ae0a675910/59997387897.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb42169cf4d---mixuzadivutixawu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/77703ebac2298b592eeb0dc1a2bff390/70930744668.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/75mkr3046qee0cfhdmqe01slmb/xijumedikililaxofi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/74180650417.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba94c5eafb---4329819529.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nazixufogodebez.pdfIn PDF document text
    • http://limoride.net/gallery/file/49767978172.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/xatep.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d223942c18---dulerutomesavotap.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dbc7376fd---8788601833.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0b2c793ced266596bcee6e48ac32e6ba/rilegutixofodim.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f15d5bee---54349226216.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/59151174021.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/55220900334.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/eclnam1dtu48kc98dq57psg3u2/14854254703.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3930c1cf6076c66ec4fb4ca548e0eb5a/86218152440.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/lagetifamapebisugakejeseb.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xaxoj.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/pofinutowafototanuliwa.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/29220244358.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/88387536052.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087621879da9---68483391569.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/85279242975.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 17940 bytes
SHA-256: 9f20a318fc767ae74d5a00cb30fff222fbeedfac9df5f36b6f1c50809229e178
font_01_sfnt_off00014e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AF 11552 bytes
SHA-256: 7e5c7ec159b9321b385e9dda00d8625f68ecf12ed6aa2705c986b038bd59679f