Malicious PDF — malware analysis report

Static analysis result for SHA-256 248c808e3c601881…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 08:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c74731df711e22f4433abaeb238d54e SHA-1: 4d47700a797711f1d241f1a8bddd7ba750efd367 SHA-256: 248c808e3c6018818d85273c45e0b9e18aef9f6ddd192031441f9aafbab7d28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hflbdq.com/uploads/file/081716233166.pdf In PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/porokopividusaz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9bbbccde---91068922674.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/79490144810.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/34866680156.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xobaduwugorozas.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/55969018027.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/faxebewujarameje.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/xadozubapupuvumolasoxovez.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/87356418993.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/47486290286.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jumor.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/22942068602.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/88077576858.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/p86g9fsrh22r9u25o2f2knspr9/55881646543.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexafufixasobi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/42831232683.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/katozopuvivamomiwukixov.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/zalabowokonedopofubexip.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/mulazivesoxufipenuxezafa.pdfIn PDF document text
    • http://hidramaco.com/files/files/48596114689.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9179b526d---xasasidotebosuxi.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gilonagimodowevixase.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/gezubevibovesuwiwuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=good+witch+season+6+episode+3+watch+online+freePDF 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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 16852 bytes
SHA-256: 8a531e3d1cce50369433b145bcd9da6b112aec7c7d5f1513578ceb5fe607ba29
font_01_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 11184 bytes
SHA-256: c713ed24b80fa2409e52a723271848afb948f875ebe821d2883e800ecca38178
font_02_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1