Malicious PDF — malware analysis report

Static analysis result for SHA-256 e613513c87cbb453…

MALICIOUS

PDF

126.2 KB Created: 2021-07-25 20:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6df85c15d5a1fd29ea65e3c1e0222fdf SHA-1: 6cdc37a4accdc2669ec046ac930195f02810c79c SHA-256: e613513c87cbb45311cf855a3ed1c50c456f5d37ae39d742a2093ee7eea6fb33
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple URLs hosted on compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick the user into downloading something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1eb8857e---35522329614.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p9kqek8vjcmkk411ma2dfbtknq/namesifomasunepigonulupoz.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/gugagufaxekejozuz.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/70299430711.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/o3lcbr0f0eafsr44r5aq2nrsq3/15804032215.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f688a5ee86---57316705483.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d624f0d1c6---40359242734.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/fetotamivugovobudi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/vefozep.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5c952b816---luzejikipipevomus.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a8d1e45211f858658f995153c42ad738/86919182429.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608827447c105---sekagozasigexaboxesajan.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/vogazupigoziv.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jepixuzor.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/bojewavatoxabixetoferobun.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d00b99788a8fe1be56b0a466afc6dade/73845746361.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/f9reblbmas8l36n2bkaeku22br/70708924773.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vonejajijejiw.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/34771651255.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/rizaxazesanox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lighting+for+cinematography+david+landau+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aabb68db0---69800376823.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_off00018910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18910 17952 bytes
SHA-256: a320ff3e99acd54b1ce8026153504fb6f3760b186bb65428518792450c0a4f54
font_01_sfnt_off0001b7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7FD 11224 bytes
SHA-256: 2998bb2d3ee7320654c88117fee1afb2ceb7d13b2d35e2d075077ddc6f22b15e
font_02_sfnt_off0001d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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