Malicious PDF — malware analysis report

Static analysis result for SHA-256 4023131375ff4778…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 21:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d166dfb4d381a374fbd483bcdf6ea9c6 SHA-1: f5fd4101d29faf5db8ea8bb1691d376c944141be SHA-256: 4023131375ff4778b6ff3e7ce0b4339b33378be9f509b97824fb1fcfee607820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, points towards an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://alompar.hu/uploads/content_files/files/1171508722.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161002fe16fdcb---soboduxegaxej.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/maditaxakiremolekaga.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/41513625833.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/badamumaxa.pdfIn PDF document text
    • http://iltorg.ru/upload/file/75382836425.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/93234252906.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/7s9p6oq8sre3f1dch5cb9df58b/17841164348.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/44614635922.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/5681331554.pdfIn PDF document text
    • http://cartopack.be/Images/file/xefomulu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1a2e0d9f---19205746274.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/460743d4ac00d59246fc3cd445bcfbc9/85592019372.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/80790495776.pdfIn PDF document text
    • http://congluc.com/upload/files/linugozi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecbe6c009fca97bea895389b2a912646/65853887704.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/24294a5039094d1f937d7815bf2f9f11/kizajedux.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vb1q1ig1kb8u984hc28rkogpmt/75679141282.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/38612219461.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b554b2fe7d---8898098762.pdfIn PDF document text
    • https://arerp.kr/data/file///safobozolo.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/40201297520.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/47766889201.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/3534751656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=resident+evil+5+cheat+codes+ps3PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18936 bytes
SHA-256: 217ef6c3d5c1f1c378ad42285c590392aa14d224b4c6829a0e4b80a6882b8a22
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 10928 bytes
SHA-256: 5c8229a060f53b96734ac8cb107926b17f977c0d1798dc2d8c33524a1228c122