Malicious PDF — malware analysis report

Static analysis result for SHA-256 0795baec037093c1…

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 05:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22c2da01e99a0920f3e23754979096e7 SHA-1: 8f3ba5de345ca48872cf6856053e8d3fdc81f31b SHA-256: 0795baec037093c180b4ef7e9239487d37fa11fba07e762d0c2a4e7dbb05e5e1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable hosting or potentially malicious content, strongly suggests a phishing or malware distribution scheme.

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 https://epagneuls-bretons.fr/caningest/images/file/50940504380.pdf In PDF document text
    • http://abc-tel.ru/data/File/92752571056.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3a00a6e8---46227377845.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/vavonuniverakupefa.pdfIn PDF document text
    • https://stopserv.ru/files/file/53032604195.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/88682215995.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/dikixenuvef.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f014ce5f39f41805a11597b45a5645c4/wudorufokum.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/liwedativ.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/mefavelagotasofavumafuxo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/89457061758.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/31909192465.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/mulozuzopel.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/63018538224.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/rutuzidufijegerotujupati.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wuvigejajotux.pdfIn PDF document text
    • http://tion.hu/upload/file/90302134222.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dazasegukigid.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lozekovoxunejularizu.pdfIn PDF document text
    • http://kammed.com/userfiles/file/medamovogurumujobufidu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130453d3c0cb---zumemutolonedofewexutowe.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/tanomamajuwegivaxu.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210915225755.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/84197319119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+to+indesignPDF 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_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 10560 bytes
SHA-256: fc1117bb66dbe9fb55dc6996f3d04a87aec730c0316e9755fb9c6a245ed8a8f9
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 17672 bytes
SHA-256: bef27aeccdc66f6b169b4537382aeb3cd3a0dad3add8305f96193a96364a063d