Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5e8b7319b0cfbb…

MALICIOUS

PDF

87.1 KB Created: 2021-08-31 22:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17d9c75056d5459be077b8a48234126b SHA-1: df177873dc5713da9799e0bf3d90560375986aba SHA-256: 1b5e8b7319b0cfbb9f74618ba4282a44b612b427d2ca727a6d6540a89eb7168d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. It contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable link farms. The primary function seems to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=is+potato+a+root+vegetable PDF link annotation
    • http://gesundimjob.at/images/content/files/47734544921.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/32196895584.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210512141657964130498.pdfIn PDF document text
    • http://stisk.com/file/mesupevuzi.pdfIn PDF document text
    • https://isleo.com/i_photos/file/lukaxaxomepajabivuxuduguv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d937cb969c---50438289184.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5ac8a76d9dfbffc9a25210fccc10a925/31394874623.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5358368ec2---gakawapivifapolekimasizo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115b760b20c0---zinabokavu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2122c17bf8174ba50577802d098ea5fa/rudun.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da447f64c43---gojagemizevijumajikeso.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gakulekeverexazamevamosi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/27a65d6428a9c8869af07ab948f765f0/4824210752.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/jusitaduvunelasudok.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/tunapo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/61281479239.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/470541588.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113d06a52578---27683359483.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/jazafek.pdfIn PDF document text
    • http://edeins.com/userfiles/file/73064057279.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7112da136---wugoremixituza.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/82140847154.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/67722090026.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/99123356659.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 18908 bytes
SHA-256: dab2e9b0e485fe0ed0fdec1f52af1c074f2100e3bd78281423994708febdb0a2
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 10388 bytes
SHA-256: f7980fe3c063c221dd0a257885172e985e1f4a218868ef2be9b7d9ec001a3b51
font_02_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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