Malicious PDF — malware analysis report

Static analysis result for SHA-256 450ec431ce10313a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-30 18:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01a40f2404612f1689231a9a516d4147 SHA-1: aff327e6424d9cc4b07c162313e1a766e7cf66b1 SHA-256: 450ec431ce10313a64b37941ac95635dab0befac900b9278d5a35e7715078e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially compromised websites. The presence of embedded URLs further supports its role as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=libro+de+matematicas+discretas+pdf PDF link annotation
    • http://hairfibers24.com/upload/file/fopejepedadipu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31e781cad2aaa88c622fd3d4496321cb/28617629303.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/84407319651.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gi35hv2g3vbr4rhjg0k7e90a6j/65034055071.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/92a0f1dabb19e0f804324446181c9753/89807637690.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/tigofurikekipapaviko.pdfIn PDF document text
    • http://52963566.com/upload/file/202109182224000275.pdfIn PDF document text
    • https://mauspro.net/upload/files/40907551190.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/tajakikelenokiviwanire.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/76421172210.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/nenixobufuzisowubopo.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/bubomazinewefevagexaz.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/diwub.pdfIn PDF document text
    • http://lex.tj/img/file/55761005804.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/96961901105.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/fuvutugukilanisimab.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210916_F394D4DAFBB0324B.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/12016959894.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ef3f6a9---1041445347.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/depudemebujemoku.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/73674770695.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/tonukidisorigexid.pdfIn PDF document text
    • https://sitarasign.ir/data/file/3429403079.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/40295246064.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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 10728 bytes
SHA-256: 9b96d7e2b999a37f95d71eb0c5aff2ebf86d954193478ede8a938be02db83156
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 19152 bytes
SHA-256: 2709da840727e52ba633171df39366c901a53e8d54878b851ed179c87992e8ab
font_02_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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