Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7648210af490806…

MALICIOUS

PDF

97.3 KB Created: 2021-07-31 17:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 59052216bb73db5ac4fbb2cbddfe7a33 SHA-1: d357284c2cd5c17fb84a70cae2bbcd40bfbfa8d1 SHA-256: d7648210af490806e6031e35a5d8a83406876555ec089f7d202049c7f88bcbc6
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as Pdf.Phishing.Trojan. The presence of numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a deceptive call-to-action, likely intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=anime+apk+offline+mode PDF link annotation
    • http://dgjst.com/upfile/file/17512916101.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/rewuduruzofepobup.pdfIn PDF document text
    • http://www.bash.cl/media/file/dagalode.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7f9b4777918a9790dad947d11db2d15/65803932856.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/zilobirixu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/63017525fb94c1ef837e8e74474f3c39/41001821383.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/74db76a0705fd787b30a771ae2dbe3ba/futafadapevuba.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7f169e4b---45349368291.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/xubivosirikazefasavubikez.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3d9c52cb4f3c5abf5b8ea1c6fc92ba40/lowokeso.pdfIn PDF document text
    • https://nadamasristorante.it/file/ritawel.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/movefomewakanonuri.pdfIn PDF document text
    • https://luminex.pl/upload/file/11125261377.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0pkvn2m94uomvjr89f14pkid56/vigelavejukemuposuza.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f9776a2c---38049234195.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5d0d235afb098f7f93b72b90f77af882/fonatoz.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/37050060851.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608870a449b7f---magetorufawatusitadagira.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiwifoguvifobavuza.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/20538691873.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/72551530588.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 17640 bytes
SHA-256: c4b94b3f17f7063ad547df99b089817be7396ace6bc15efeb6cfe113d50c0eca
font_02_sfnt_off00014a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A32 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off0001603e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603E 10368 bytes
SHA-256: bbe33a84d89db11d92fc243d644244850c7b9ef61ab66ad5899c16ca0192138f

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