Malicious PDF — malware analysis report

Static analysis result for SHA-256 350d8f40bfaa1a87…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 05:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a80b9ec4349e2f9a20fd492bb18a4d32 SHA-1: e603b3bd90cce9e50fe7c2555bb3ab2b6be15ec8 SHA-256: 350d8f40bfaa1a874e6bd02da190d8882e4d0cbb3f2c718659735b22ad48e34e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, some pointing to domains that appear to be compromised or disposable, suggesting a phishing or SEO spam campaign. The PDF structure itself does not contain readable content, but the embedded links and the nature of the heuristics strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://alexandrapanayotou.com/web/images/static/file/sawowira.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/7240100996.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610271629f51c---zosiferus.pdfIn PDF document text
    • https://mattress-leader.com/media/83275901372.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/61650907134.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6rceurtbcopi29de2imm7p4i1k/kipetopizesetavitebogifu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/624324572a16ea0211dcf597937af63b/vutawobofat.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/xewamox.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f967f0ef51d---luzutiwefewejose.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/jokunizapako.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b326008355f---zuzalofukibefibupatig.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zadebifojo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a75e6a3818e625371de401e7df000ac3/suzixixewubumugewana.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v740lt1b9eb2ndehkklh8dd0ce/kujis.pdfIn PDF document text
    • http://weingut-suppan.at/files/77958692890.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81b75a1e5---fowap.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/tuposanaguli.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/20lr57s06ammqlcustrleppnt7/tusowobu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ratufovajavipijuto.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/xuvabowuxaxosuli.pdfIn PDF document text
    • https://dineflon.com//files/8154218677.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/joxotojagefenefuvavaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=design+of+steel+structures+code+book+pdfPDF 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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 16096 bytes
SHA-256: 854706fe2edf87109e715fc28ed28e315b5f6bdab64685532558c0474dee3c38
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10964 bytes
SHA-256: 9d23e5e5ae7373b7c14f217d23d1a5717cb794ed888ad21e0c289e168200231a
font_02_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.