Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f1dc2becceb5b9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 23:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2979c19e4f8058df2612ad060cf34ee4 SHA-1: 7e636ff6f0bfcbeab8f3cc8a5b360f901c1ec733 SHA-256: e7f1dc2becceb5b9d1060e7f08aae238ddd9f494b462098171e766a19f30030d
156 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. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, suggesting an intent to redirect users to phishing sites or download further malware. The presence of external URIs and link farms on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=star+wars+hero%27s+journey+worksheet PDF link annotation
    • http://cngwalk.com/fckeditor/userfiles/image/84051924178.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/deejcrv7ovp5jhb1dbecfl28uq/95609673419.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d52dc0797e5e260d32fac7dd9beead97/kavunupixalonolejulajadup.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a78c0bd23704bbcef8c7eb10ce5573c1/funuzajefaxalizivino.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/pitufojesosajav.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/takofonigulukeker.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/af759bf46ac5f6763bf2d46812095de0/74088922190.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210701/210701034911691917xio1imp3ppwk.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4055aa1f3---51388957731.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108142249598394.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2441edc2---rulorepotufubapomaduzazo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5c842a7b---xawiko.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbb712b614---tunotasuzolofev.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4606e6f33e---dagamoxaposewudo.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/newexajexonut.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/larovuser.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84979aeea2---keremitafipin.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/93864486550.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210616163327.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc01a440---vizimekixazutumogumeb.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a6fcf20c3c81764260a458cca0b9b395/reridiz.pdfIn PDF document text
    • https://codecs.ro/images/file/negex.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vubawom.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/jamidapodolilitelufinowak.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246046fc8f---resorelotaxuwenoxosefi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bdd158cc45d43a8c9a894ea4033d097a/22904239550.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10696 bytes
SHA-256: ad525725469ac731557d802502864dfc2918622cbc19a550371cf17107bef060
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 18280 bytes
SHA-256: ac5e345ef12c49a1a29accbf683b79d8302d71bccfdacb094e34362dcb1d92cc
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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