Malicious PDF — malware analysis report

Static analysis result for SHA-256 89938fc593cc8ff3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 05:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a4cb5474ce35cd0fb1866a9fcd62f5e1 SHA-1: 9946b39a71547d3c78d07ededb2d87f0d65d65ed SHA-256: 89938fc593cc8ff31f7fcfd2066186da32e8a777205ea5d0c8cfaf6b953b9b1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=m+tera+hero+full+movie+download PDF link annotation
    • http://prabashproperties.com/ckfinder/userfiles/files/vexidulubod.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138258dbf367---widinilodoboruxupozinarus.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/86905536605.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/34956055782.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/43993860239.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/29571552717.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/kakadereg.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7gdua6ji1837dpq2n7qn9soj50/49771055603.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/kevozag.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wurimaverazikava.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/65649009383.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3d899919a4ee616e4ecb9636a4f45418/22645100593.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/82033659939.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96549112711.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/32402804293.pdfIn PDF document text
    • https://adikkedua.com/contents/files/85084152489.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/10708071740.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zafivenulevomogeka.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/doxilivuz.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97320412800.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/torofeni.pdfIn PDF document text
    • https://ratodua.com/contents/files/65887176499.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/94602723529.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96687051664.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/beduwojanezajalawozafepi.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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 18024 bytes
SHA-256: 91461a1c2a6357bac5698f5dee583b4b5ac8d3d93404ddf1310511c469bdebb7
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10696 bytes
SHA-256: 5a705cca5214e879f0924c64f101e41892e0c0872bc33f25ec9ba6c4c2c9227e

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