Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d8455a2929b755…

MALICIOUS

PDF

75.7 KB Created: 2021-08-28 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4b547865555ac87c259e1b0c35cdf4e4 SHA-1: cdaa5bfd53dd21a46c75319c6883d4cf62eef635 SHA-256: e1d8455a2929b755c250f2c18d3b5276b504624e0db9f15b9994f35db46f899f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for credential harvesting or further malware delivery. The embedded URLs and the heuristic firings indicate a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=high+paying+jobs+with+a+criminology+degree PDF link annotation
    • http://palirna-frydek.cz/uploaded/file/51946505240.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/64922969638.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mizowobonasozibagu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/91939459554.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/xojozutuzuxidajopoji.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/35139bf3483366d9921554f2053f4187/44084467752.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/karaz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a35264f49f1d3c852a1598309a4e146a/12761368452.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021814510192042.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/argk7ih92vp35r1i16eec47gl4/lamupobe.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/56839898998.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108252238326633.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c8fe9558dafafc6b4658d907d9c9816b/mafuli.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/82744156381.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/1673115121.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506000436771208542.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/40940224992.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160efda518a02a---telotoribigogexupinefu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/48998994259.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9a95b24b---vabuxinowojo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/1894580525.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nusutizapamekusoxifepigu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xofupurimediz.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/78718845758.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d4763a034ec9faba957c753fa7ea98dc/4675858410.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/be36b5b7fda4ad2cec3ede3851efde58/xipujaxupe.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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 16560 bytes
SHA-256: 4a285620d081ead49837e7551117356d1f99a61bdddf07d8ed57aba306c3aa0e
font_01_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 11424 bytes
SHA-256: 78495ff9d7f15c7381b5a3e970aaa0c5e6e24ed390f375dac6a1c780a79c5c9b
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1