Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf28bdfd5f7b8a0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 15:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78b0bf3b66810c93736bc366ef297239 SHA-1: a907f5208971d1513ca0164cb8e6977cfcbb40e5 SHA-256: 6bf28bdfd5f7b8a03bc02418bdea43b8298916ca36bc1e189db33df863855d46
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://heureka-cz.eu/files/wadijo.pdf In PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/31258845219.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/53399425800.pdfIn PDF document text
    • https://ip-pharma.net/data/files/16849093674.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/34742002728.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/22583016819.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/09i8r8al0ijhdgqljj79f6sg67/60897441565.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/dagamigomusomalafofag.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/39bd64c78ff20e2fd19285f475fe708e/31001562121.pdfIn PDF document text
    • http://metallpress.ru/files/zimigafikuri.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/87923228346.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/disurezunur.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/nubedijapogedizewedi.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30513253958.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/pefituvukekozevifuvereje.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/7077491357.pdfIn PDF document text
    • https://geniodelweb.com/file/xibusijavobixarefexaraf.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/76a72645a7f3203b7d4ab782ab9f8703/gifonidebinuv.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/17618271324.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d67e2944---jawupemojadafa.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/58190824074.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/8049186827.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf87b21b86b---xeriwanewijunun.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9ad31240---lidagovexuvava.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f360eb162---68968562766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=animals+crossword+puzzle+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1d6bd4f73b07bc53757f549e73a96789/goxukisakariz.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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 18800 bytes
SHA-256: 837f645fcf91522c83c0666995ef7bf0bf89da8ae3866d4dc4deb06f91338e2f
font_01_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 10804 bytes
SHA-256: ffa6cf0e85967f58823ca6007a22713dff3cd85e38b00ece9915a82ac28568dc
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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