Malicious PDF — malware analysis report

Static analysis result for SHA-256 28862fe8bb0f58e3…

MALICIOUS

PDF

97.6 KB Created: 2021-09-04 17:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c91eb30c5dcb2358bdcbec91d4284ee6 SHA-1: 66b5fc8f01eeb659eb4126ec47278beffaf7108e SHA-256: 28862fe8bb0f58e378efeb01219350f831b3391b24396c22a54fcb36dc346f53
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5a269552---33429031910.pdf In PDF document text
    • http://calisnt.com/uploads/files/pomoresu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s29immkvrvem9rfcrutf0r31l3/kujagezodavezoteb.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/50c80bf3c12215e9089638d0e8af5a4d/walolimerotugerof.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/nagixowivu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9afed3d953---91208127138.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/37730628066.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sugebezululunagufu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d022ff9059ce57490f0bc374234dfef1/13737323384.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/bexaduratofanutenakonesej.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/4397170452.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/81539105907.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/dimolovomudebinezen.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b2158776d1d---zolaborisajowuparimatuli.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/19b5256eee8e36e184c8a973ed3e736b/vajidusunigurutubu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3fea6b1132d029fc868e52e0f52e8470/pimuzigiwugozevef.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/57220349521.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/pufivadugerun.pdfIn PDF document text
    • https://bczenekar.hu/files/file/77695071538.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084850f75893---40251270816.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/87755081531.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/84135041408.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/14729696911.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d080529132---41825911275.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zemexaserutamukiwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=social+media+marketing+books+pdfPDF link annotation
    • 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_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 18136 bytes
SHA-256: 5eeafb3d64508362041215ef331d6fa24f6d441cc71a6f4bc6e2205ca6306239
font_01_sfnt_off0001464e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E65 11272 bytes
SHA-256: b940a2f1b1961b3a467a4274339f8a4ee1ca2c0af814b93b563b45215101d35b

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