Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc35116310bed99…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 10:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e33d1583c224a4768bde4ca4336b7892 SHA-1: 8efe75ef3186a6070ab69004d1c45b10c6aec656 SHA-256: efc35116310bed99e74403ca59ec5bfd6df356e4f6acb5f7fb121383f15ca0b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URLs, indicating a phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, such as the one found at 'https://inwebjor.ru/uplcv?utm_term=sorry+root+access+is+not+properly+installed+on+this+device', which is designed to trick users into believing their device has an issue and potentially lead to credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=sorry+root+access+is+not+properly+installed+on+this+device PDF link annotation
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/51838840771.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140912b8200f---6953265016.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/velewoxakelare.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/61606856816.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/62896549030.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/47049328961.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2afd660085d4e6f710466f80b4b4175c/todawedivolovamajovufe.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109031251227573.pdfIn PDF document text
    • http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/94469332228.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/99525993145.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gesujidun.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/79c17c560b9eee7f9af42f6cc9b0d04b/gufevarisizegutek.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/87288548015.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/55830205186.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/bamibetema.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/72195720288.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/fimegawaxujaver.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vobisefovadojenoviledux.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/987309909.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/nesesakuxa.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/7681005845.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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 18880 bytes
SHA-256: a90fd05904b2fcf2530c3ee2c5633e142e3252edaeea1a0a730f3e416ff7b440
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 10868 bytes
SHA-256: e61b00499392703bd65fc1650c6452e1129c97766f3562b07ba1cb78b001cfa3

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