Malicious PDF — malware analysis report

Static analysis result for SHA-256 8163fecc93491222…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 10:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d480e24342071a72662b0b6fa08bbaa SHA-1: da8baa9cfe06f69dab3b33fb02f1b8b161c5d5e8 SHA-256: 8163fecc93491222f023738a8a0891283ed0b96cab8f6bc6b1631b2e15ff2c09
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document's structure is identified as a link farm, likely intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=the+true+history+of+the+conquest+of+new+spain+pdf PDF link annotation
    • https://tavio.ru/files/file/73085643093.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rc34etmdkg29cmsgd2dj6jvc23/40136812504.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/57430303277.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/16107770830.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137488a3c7f3---xifarefovutokudemasip.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/gusigoxudo.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/zezujetexegano.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0340d79bf---derifatimatapoduvavatow.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wamajavinaduterakazakam.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/52444946865.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/kodewasozomuxabepo.pdfIn PDF document text
    • http://mebco.ru/images/file/mefokufubamiganimikasidaf.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/70017212360.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/15357941885.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jugofenofewegaxidefiro.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908192902.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/77089852793.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tesoba.pdfIn PDF document text
    • https://podimercrm.com/img/files/sutopulelur.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346e3784af3---dixeredevoruxopozij.pdfIn PDF document text
    • http://meta-min.com/files/petiberumufopaxozaxekope.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc3e53862---wepepizulojegonejejagelir.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/84919618294.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/zejidinanub.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/segasidof.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109010730256465.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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 16900 bytes
SHA-256: 638bd70037b87a4729d80df7ee910a71b565e2e91036c4089d9ccf290217f673
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 11080 bytes
SHA-256: 04226f5dbc1deec199a612bf133bf698a6f08b1593ccefa8c51bee338f0d1abf

Open this report in the interactive analyzer, or submit your own file for analysis.