Malicious PDF — malware analysis report

Static analysis result for SHA-256 2528951d901d7070…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 12:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 671376a25e9bf1c0c4ac7644bb9f0dcf SHA-1: 79a49a0f37559b2c2a1378d3c5caff6ba32bccbd SHA-256: 2528951d901d70702fc9d5dbd7b9b24e82a5a72f6c69dea393c717e4bef90049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://eurolocal.info/sites/default/files/images/file/narotaler.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/4594898543.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/bedufetejobomurixusutut.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jimuvivuravajatimed.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5c591d4f708f6e905d9dc8ca9b69b5f0/2967939131.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138e855ca105---6020439528.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f6a9103a54d00c6d24643e2e5b88078b/26117440366.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/vupupowuleno.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dadawokorufebax.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/14269651766.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/70410554241.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/xetavawobakaziseluf.pdfIn PDF document text
    • http://placc.info/up_image/72654773079.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/rapuvejipepodikadoj.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/10199211734.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/27342057842.pdfIn PDF document text
    • http://sung1.com/upload/files/vifesadorosovanuketodi.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wipifirorakoweg.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/zasoba.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9ea77be---gawuk.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/48669671533.pdfIn PDF document text
    • http://agama-rc.com/upload/files/57293189432.pdfIn PDF document text
    • http://philipsphotographystudio.com/3057945996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=transfer+esim+to+new+phone+androidPDF 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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 16276 bytes
SHA-256: f259dcba745db36abab5f6d4930a7e54ef81ec0fa877fd1eacf58a49cdefa648
font_01_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 10764 bytes
SHA-256: af72916d99899d3ce156be233e72946c5b9c17f2a6d5d4481fcc4146e7325ff9
font_02_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1