Malicious PDF — malware analysis report

Static analysis result for SHA-256 8759fe9ec2fd3550…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 11:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5f59592c858833d8a619cfa759ab910 SHA-1: ea12f44624ad74f9960f623d90e2680669183009 SHA-256: 8759fe9ec2fd3550d694ec2eb19f6a43d6b2013012c741598b9c01d56adcd1d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=quantitative+comparative+analysis+pdf PDF link annotation
    • https://le27.fr/docs/file/7787039775.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/76880637824.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9abfe1c01---26937448112.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/96287716948.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sagevujoxoxenugasama.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160daf12fb54f2---goledusokowedegub.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98c9009ba---11005560520.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rld8r0s7lfo3usgr2hbi7rn573/mopikonifirufuwimu.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7730203f---dokusuwuruxagif.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/59395058295.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2vvifqp3i15mk1lu7ms3io6i9t/lufizekiwuguzogedesoko.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///pakifurukapejopudiz.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/xibum.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/kowobam.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/obexolinorulis.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rukijep.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/tikapeduzutizipesit.pdfIn PDF document text
    • https://chp-travel.ir/data/file/tetebumamewixunoxar.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/9039609500.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/88338545417.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/jegunugowukotanijusilina.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7f7285a76a635922928e6e28cfebf59/miwekadakugeloxe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d456029655---6783442124.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c1f17cd28---wituxam.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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 17868 bytes
SHA-256: 217c63b08a4932b7da84289cba53db9ec3365f627d9fe0ad7fbaa204da7b0290
font_01_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 11120 bytes
SHA-256: 458df9ad68a01efe9b2c4c1899e65db6c35ff4a1b5f7b2f8683bead1b0d18cf0
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1