Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de5de8a72726451…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 22:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a66b9d28ff4b80330ddf7a7ed9cb977 SHA-1: a0ed5d7b98af1d419a9f0cf71326bcb60e83880b SHA-256: 5de5de8a72726451bb56c84a33bcfa7549419b2dce989a5a0c9a8974a7d067d1
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://seasonsblinds.com/uploads/ckfinder/userfiles/files/58439430110.pdf In PDF document text
    • http://versobrokers.eu/userfiles/files/6507473048.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/78335576472.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/47659221509.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/58561037151.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/puxoza.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/wazuselipok.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/zefigadit.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pafiganob.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9195d9fe4---mupikonuzevujolupuja.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///34832998574.pdfIn PDF document text
    • https://luminex.pl/upload/file/45903612100.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/88845800349.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lifudogarexa.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/79058704278.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/33708137175.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/45751816169.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d312a00ec---62135504821.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a67803d4---rugilevagagokizuravabube.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/kikenofab.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/kafixod.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/gududewavirib.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/28604206057.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/suwafudezu.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/64950713105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+gacha+club+apkPDF 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_off0000ba94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 18772 bytes
SHA-256: 74d0e72fe70ce5238b8787691d14301ada2847b2d5010908296e61428c9bcb0b
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10624 bytes
SHA-256: 4e60bda7916dd82ffd61402965fad3038eac8458992f14b9c49f6b2b0d77d599