Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6625ff7fefca72…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 16:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4405e43226b71b92d7f53d38875b8eb SHA-1: 1519b0f27980f460ac9603f1786e57f16f7c3837 SHA-256: fc6625ff7fefca7298dd374d25032bc33c44e7113d8b49b6b9ea3fda0c18c038
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous external URIs pointing to potentially compromised websites and disposable hosting. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=what+is+apk+installer PDF link annotation
    • https://o2opr.co/userfiles/files/69634695755.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/16341144320.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/81007350860.pdfIn PDF document text
    • http://infoguard.ru/content/file/xivuferegitinudabeze.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/86795501520.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2f540950ee6d2f705fb8aad2db391142/29954265443.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210905_8D70E211AE353A8F.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wivanunevunedeme.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/91606908439.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/16028426668.pdfIn PDF document text
    • http://samtekelektrik.com/files/89868187606.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/bafepenedopete.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/11803095439.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/livojeda.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/vijosadixuzifi.pdfIn PDF document text
    • http://alvitraders.com/files/26179420082.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403fe851e82---17079392957.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9c90b32e---91497168191.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mojesesik.pdfIn PDF document text
    • https://lordoptika.hu/files/files/98904875984.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410ef350cc1---difuvidegapumi.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/repajapaxixafesilan.pdfIn PDF document text
    • http://rjt1.org/upload/files/midixogasetosavejigonom.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 17444 bytes
SHA-256: 5fc042307c7c973587265edf039d063fd471a59a08aa6cb5662bab81fdb54631
font_02_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 10316 bytes
SHA-256: d9b444573a21a64443932520119fd13dd07c6bc578be014969bc2caa21cdb5e4

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