Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf5d9f570127968…

MALICIOUS

PDF

95.4 KB Created: 2021-09-11 23:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8c338b9fa089095226415e35cde466a SHA-1: 326e51c9effbef918c70cb380262108a629d2b3e SHA-256: aaf5d9f570127968508c670d187208fe0f8c57772061227ec5485f547025feab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and compromised CMS uploads suggests an attempt to leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://smidgel.ru/uplcv?utm_term=hacks+for+the+sims+mobile PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613007eb865cc---novafologonijafedale.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8ddjurssqcp1dc8gnvm6ndpapd/3464023414.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/zuduvetutivigasobuwanunem.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/5232482105.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdc840944---20525152401.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/36278762910.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gop2kenool17uhfvr5i4gfscq4/3748603907.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/wefiloju.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bivavimidujudadawup.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/21770810573.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tavubepoxoperekuna.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/dogatobuke.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/80805266498.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7f040aa0---nakebijara.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/14128552927.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a634bf3e51a74018871c9634ff6913f2/17998024907.pdfIn PDF document text
    • https://fptica.ru/images/file/55840683909.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/53a31301b6791ab4ef452859120aefd1/5949724094.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/welorumubumugaxi.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///sukuwepu.pdfIn PDF document text
    • https://5uempat.com/contents/files/1232488860.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/59827836019.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gusisopiva.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/2841726293.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_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 19448 bytes
SHA-256: f1add41414ff3a59d51d43bbe0d60f5ca51ba7f78cd192a4dd56955a2ad86e1b
font_01_sfnt_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 10720 bytes
SHA-256: bc7f5ab6dd1122b4025879f11b68dd2b81230e995ba0565984cbfc72107ddefb
font_02_sfnt_off000157b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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