Malicious PDF — malware analysis report

Static analysis result for SHA-256 818edbba5b9a6f9b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 19:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d7f21190965cd17cdf9eb0345623779 SHA-1: 2941b5e05a8f3fdf8cfc216296827b9fb2bc9e0e SHA-256: 818edbba5b9a6f9b55a040c2af0cf6765a5bbe353cc3cd68255860eadcc79058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=mole+conversion+practice+pdf PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jqonhc0n134m41avulqb7b1d40/42108541408.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/60759037751.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/nilesabijorivokedik.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/15082886097.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92437e9e2---2527434942.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26919677269.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/86883189763.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/motebaf.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2e39e3b82d6b8549737292ca630f04f7/42254225744.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jt4j912p7aeb48m6hbri5c72s7/vujajagakaga.pdfIn PDF document text
    • http://jcpingie.be/public/files/sovuras.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/ludaton.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9b049e0cd---zizonekabevas.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac308bc79---jiposegigefuliwel.pdfIn PDF document text
    • https://telenovella-bg.com/files/sidalopiwujutakifuw.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/raselimotazorasujebasiwu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b306d6e81a3---47045547598.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/96357165773.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ask3juskjp10v6to9mspj0l4nq/zubazawunefafa.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/23718331057.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/duponupufiluxezenotu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d12063ad28deef0df1a95eea4a6876bb/96723863468.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/zakimonafasanisoxijoxulev.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 18708 bytes
SHA-256: 367ab4b0ebbf3aed213244989e2228092c9be318550c713e74e7e9bb00f1f3de
font_01_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 10672 bytes
SHA-256: 9476d1a0dfd68f4400c518c7d5b228b1e071bf4a02bc1d259b65d9474a3db709
font_02_sfnt_off000133f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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