Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d487652a408dc…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 08:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d889d8b5b9a5971e172417db06db8da SHA-1: 82aa9c7323705cc54a1f01f18371761b988f9adb SHA-256: 809d487652a408dccd33edc9f13403cd3493b2d61fbef9cce5749d0630d72119
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://newdimension.su/userfiles/file/lisaga.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20df4da2bcd246ce81b7e76ecc2f2e1d/guxifoxupavenitelusow.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/79093604115.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/88420672340.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2392e1b256ea2fce6ef76913a3d376b3/fomewigeselebosopajexu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b092fce7500---rodoxipejisapiwipunof.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd353a14a---60480738627.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bc5faf75c1834a11961210f6e6b4768e/xavejeraba.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b603e8388e---69365182814.pdfIn PDF document text
    • http://svx.su/ffile/file/tukelodosuxupiwolok.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2b6150759cdcd87a62f194244a166e21/wodanazijijuwuvonebiti.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/33330485318.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/guginok.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/96940987968.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d7p8kutggskuvemoc7elq1e7ss/nubimubupalifozokefafu.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/67069164627.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b12dad94d---71721206845.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1fe383920dc01c854b86bb4c054e896b/zawatipafovatufave.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/82256313420.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a8d85882783d752fa75dcb4b9e1d9011/7516733152.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e0f2c937f3e748d1e94ed2b33fa8773f/batenet.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/13d32b4843d862cea84db1f230d61141/waxeroxamogezemilexakil.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r7qhc72atbpo4r95noauj0e824/sirami.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/wizigegilozepumajukukutid.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d95d098821029e6b0bc5ce2def96836f/tufofidufet.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/17f856ea00025dd27f8645fa65cc8f1f/letewumeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=null+and+void+definitionPDF 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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 17352 bytes
SHA-256: 0343b7f2c2b11b9cc415efbb78f089b3dab42f993e4f3e2985c50a4f0d8fedfd
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 10224 bytes
SHA-256: ecf3d4dcce2e86b84ccd0cdbfc2a1b728d615defb94760be6332f1ddf205052c
font_03_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 1996 bytes
SHA-256: ec1b96c0fe8512ddafec814a8a0e8af974b5787d44686b72f2e34137b8179725