Malicious PDF — malware analysis report

Static analysis result for SHA-256 9790e325960c15e5…

MALICIOUS

PDF

82.4 KB Created: 2021-07-04 03:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff34a2a5db9b54dfc65053eca5a85f5e SHA-1: a16bf4f63fbae3bce0307d5c002024ebc29bf4a3 SHA-256: 9790e325960c15e5c16d7c6062d61fc79bfc557cfc6033957cee4a46b40f87ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links to potentially malicious or compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dq9nrhn3pesg06kqhi8o18ospa/44202078998.pdf In PDF document text
    • http://mhinflatable.com/upload/file/31228247394.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e0c0c4793ba5e4c3f805c8d3462861c3/pofijalutuzigudifijizogu.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/nf97gj6l55v6i5o6uohoofo3h5/buzerupilewarixupod.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/9467268619.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8k8snlgjk98q0df2157rbsmu0/zuwer.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/wobegokuruva.pdfIn PDF document text
    • http://goref.ru/files/file/dujinopizepuwevoxipuramir.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/12304154932.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/40914897187.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/91c16f7a2e8a3f0867a5a0cf3eb8d851/nutobinazaveta.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/16dcv46f3ojf9a6n6466cid3q4/lolasulexudelutafig.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/65778005047.pdfIn PDF document text
    • http://dzbnf.com/upload/file///9674201437.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/62193747685.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5bea3b4d9c77e8d1bfc0e8c90588c7a3/muzejibarufuvetudisokafig.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/rapufokedunesiw.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/im0c4dmtaa8qhoa789t6bq2nq5/puwedavadovizelunom.pdfIn PDF document text
    • http://poorclarescork.ie/images/gikobafemifu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7609512722---detatokalir.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///padasol.pdfIn PDF document text
    • http://charontrade.hu/data/file/65925464898.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c2ebbf7e1eba05cc75cbecc6ccc5b64/nepezutepiwozifiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=petronas+refinery+and+petrochemical+corporationPDF 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 17224 bytes
SHA-256: 743dd3d2bbd6bfe589d25763e9a70e571bc4cc2afe69d33e2aced42693d517a5
font_01_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 11000 bytes
SHA-256: 497148d2bb10e1c2981776061514ff62f9362be28383bb81e2ae1a9fdd5f325e
font_02_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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