Malicious PDF — malware analysis report

Static analysis result for SHA-256 1939e7e10c8216c4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 04:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c65ac38c03666e1b9e6fb37d9f7fb240 SHA-1: 8169454c45168907da4d198a2816a5bb1d2f25f6 SHA-256: 1939e7e10c8216c446be23072283089286080bbc9dd9df6710be88d30a845da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coevent.ru/upload/files/biwubokulig.pdf In PDF document text
    • http://autowassenindex.nl/images/uploads/10038419626.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef744053ac---musopetejapatuxu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613007b1cdca0---6308695670.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/98844538769.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vibop.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307041837.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/limezumadokoditizebiz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132a674d21cb---lagekijugibasukoz.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/39252846447.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/jazivutopimire.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ac3f32bd4a5886cd81279559e229e0d9/winixasi.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pubusuvogixosejarobis.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/96978519165.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/weguvowaseguzobevofes.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79635202462.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/bojigekalexazukinegitavep.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/67087414578.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321525a6f4f---67918270535.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/lobisiguwetavesizugava.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/70vdsb8t7fp7mtogojgmh7a8q8/45170063734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bluetooth+tethering+application+for+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/64909647252.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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 17208 bytes
SHA-256: 3d0ff2f7613eb146835bf0ababb245f71db6d0d2ec797999152915f802774fbc
font_01_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 10884 bytes
SHA-256: 96405a812f17255af82a0021bc0d064879754e29510336f2cc034815784772e1
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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