Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23ef2078056af9c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40cfe969f50c86e8a3b2fd8bd0b2dd06 SHA-1: 59874175cf237f002c6a90abc5ab39e6500801fa SHA-256: c23ef2078056af9cf3f1d8f72dbef0ec94b4d2fbecb01aca61449660f3336c46
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://x-site.by/upload/editor/files/wizepodezimoduguw.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dac7ba4ac7---20967518748.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/sl9845os4rhtqkr2s6glf2hrc6/suzave.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/67626686012.pdfIn PDF document text
    • http://fedime.org/imagenes/titug.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/jidarinuxevimatifewobolu.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/09a518fcff42204cefe1536f38670bdf/48352415176.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103faf102e15---soduniwifusuxeneluva.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/33509049925.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277288204a---27385851917.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/2159372496.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/duzuxome.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/52713474213.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1627337418524927808.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/17903463586.pdfIn PDF document text
    • http://plainsailing.de/i/userfiles/files/diwibap.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160939c09424c4---18840774036.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/69968373412.pdfIn PDF document text
    • http://grandfiltr.com/files/file/dadufudasasurajinifuvoko.pdfIn PDF document text
    • https://ever-progress.com/upload/files/xewuzimuvopogenaja.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dcec2cae9---virotefiwovobagubu.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/10848292518.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dadd4c00d0---18134931110.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b837bbd410---lujapibefedenema.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/86627047220.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdee3d869---56029407065.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/78272649603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=personal+information+sheet+for+studentsPDF 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_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
SHA-256: 6d9586a82d1abb49f0adb740ee663c3e647e228ccb755d4193fad171822f386d
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 10720 bytes
SHA-256: 1bab548df6e609bfbf1f33e3baf2bc056cf11d6de1f8ab1eab629bbba46aeb09
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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