Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd50037b0c94353…

MALICIOUS

PDF

102.4 KB Created: 2021-06-27 20:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 02e3dad19eec699210087d11e51c9992 SHA-1: ddddb6c7f57f48ac09d01522fce55dcb28bd4ecb SHA-256: 1cd50037b0c94353c1b9184dabee466d87e9c90e23659cc16fa352860a5d0ef3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links indicate it's likely used as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2a2b4fc799381890aa8610af29abe801/30787181658.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b019c1ae7c20662556af95e4ee5f2816/jajedamafikutugez.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd140cff74---xolunumodonidewirupeji.pdfIn PDF document text
    • https://85097781.com/upload/files/ziwamogivorojili.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb236de6e8---tutabuve.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lavetizujulemalu.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/walitavaxufejeropibo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/27f325c0f0e230798f9550277089494d/23260326241.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/70183162529.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/lofarixifesulonuwegaj.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e67f6ba5c---84642114694.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09fe1bd3b9---dowopozebidegenoxuju.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/n8ugpoccmgumu5j31odmaj3mve/bexasetuxuw.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/1985618727.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b1377cca6683a74ffa5f2b98085ff248/7690785058.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ulh3k4freld8gplrl3fcjuulc3/zowagijetolerewa.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/kosojasudaxobireget.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/bogubozadof.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22da5431d8---2186259898.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853d45bcc8e---72488535535.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075af32afed8---sisitikupawibilegaguz.pdfIn PDF document text
    • https://phuquiland.com/upload/files/13801901342.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dfce0228---zidirivalenateguzariv.pdfIn PDF document text
    • http://edgecs.net/documents/24228926738.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/993941f81840c50901bfb0855e22f2cd/65380369278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=1992+presidential+candidatesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BA 10632 bytes
SHA-256: d119509a5a5ccbbb82470a0cb32c5478ff1187bb598eb28c620067432e0eb7d4
font_02_sfnt_off00015e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E39 17564 bytes
SHA-256: 7673945b880003e168a727bb43c60b0a30f709033c92412c3cff5b4944b06274