Malicious PDF — malware analysis report

Static analysis result for SHA-256 36de9163d43a043e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 08:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f65e74b6675b3e9de2e27648a133610 SHA-1: 452d2233d04413af2ab3316bfc4045512c609c69 SHA-256: 36de9163d43a043e51f22fb058513579c0efce8ca05bc1b7833e99eb4b915b2a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, which in turn redirect to other URLs. This behavior is characteristic of a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=telegram+video+group+call PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e341ad77b---ropedeminofigigoso.pdfIn PDF document text
    • http://tieuchuanthucpham.com/upload/ck/files/96836728193.pdfIn PDF document text
    • https://produse-zilan.ro/files/fedefudogebigosekisas.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614803f3bfb13---nufurimigarorobidebewurat.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/77948205863.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/63078362422.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/61242327826.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/71910823674.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/27887252355.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/zunipuromaxavaniwin.pdfIn PDF document text
    • http://topstec.com/d/files/riletiminirudofikezaxuzul.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/garetivekatikewazomifuri.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/036ae1fad6edec191e19c729f389c6b6/14864392904.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/gewilijogovikefu.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/legunedikenuririzexupej.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/13260457278.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/bixabepumazodaxe.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/77393372350.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/74420564587.pdfIn PDF document text
    • http://zzquansu.cn/d/files/45242014478.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/zumiratemegesekerakureneg.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1c39ba17---demaxadejofuzox.pdfIn PDF document text
    • http://hotechike.com/files/files/wexiverunisi.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_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 17284 bytes
SHA-256: 8dd1f4ee059e41b3b8869ece0f915234d745a824063fa5e2ee7818927d202365
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10616 bytes
SHA-256: f04cdf161ebcde5907ed04270207e6e84c00efe4772387903b892279c837f1c3
font_02_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1