Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8f023e0eb36428…

MALICIOUS

PDF

140.7 KB Created: 2021-06-27 17:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c760591a2259f56fa2fb366cb2f4206a SHA-1: 7e14f98f8a539079cc7614d52d6033c63b8a1e62 SHA-256: dc8f023e0eb36428c4a674f2da0b6e68030860194fd66f58d08b286370435992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely part of a phishing or malware distribution scheme, potentially using embedded scripts to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hitecds.com/userfiles/file/xuduniwugob.pdf In PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/8608871551.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/54829444998.pdfIn PDF document text
    • http://apvn.info/userfiles/file/disunevipap.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e808b1da---mutamitonotewaserup.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hdrbsj2r80n8bu49sma507gh67/mulajoju.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d8b7eac4e2ed7f28163a94d092e08dd4/gupuzeninenavifore.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/406493c952b6e651973ce04bda3b0d8b/kodow.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98a37fbcf2be2558f388550c4a63382f/13582953110.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/10549985018.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/bsjvn8kap47017v2pmb3r6bupa/rajebitowesapur.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/vabowowuninex.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcf1beb31b---pimalojipolutujefoko.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/89400346263.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/milawumukiboseguzopozoga.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/30328115932.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/87474793151.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a70764ecc22---jusorexidexexide.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/larekaxegam.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074703688298---48919181291.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/52339b362459d05dfff77346b373fc1a/wefadekiti.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/7228591759.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/16462946478.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762302d67b6---99605781489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=eastern+thoughts+about+selfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C330 23028 bytes
SHA-256: f50bf91e1733c30e0092cd973e0a81fdbb1aaafdae66c6b513820d52bd93ae31
font_02_sfnt_off0001fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA1C 10624 bytes
SHA-256: e54852eec9bc0148ba03ffa063cb04a00e0680cd6bad13d899631d6e3fa46069
font_03_sfnt_off00021257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21257 5152 bytes
SHA-256: ca89c8c119622466f3ef67969c14c42556dae9481b42c7aa418bf673195b7e24

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