Malicious PDF — malware analysis report

Static analysis result for SHA-256 340cfea5460b7a77…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 18:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a92c0f98b08384a6545c37cb38e35d55 SHA-1: 8ecc3404f7e918d1b9f117b19c3ff98c143e9e46 SHA-256: 340cfea5460b7a77303e9fb9318ae84a6115a6ba58320b0bf768c899f6d6235f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'free download onenote' lure in one of the URLs indicates a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d6c88b01de619dcdf3faf3f02576505a/51659761663.pdf In PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/680778184.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/60084518837.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/sufuteduzewoleselesudib.pdfIn PDF document text
    • http://machulski.com/public/file/54039779027.pdfIn PDF document text
    • https://kaimano.it/file/81523487847.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/52396044328.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/47364218973.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/95296686287.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bewasekaxufilila.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/84170393149.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/luxujosabijexomegimejaw.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/42393817707.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613add3fb1001---xaletef.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/sodusovobanafi.pdfIn PDF document text
    • https://chilepools.com/contents/files/56107101916.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6ae46eef---kujutogagowolopetari.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/fivebimabewinufubaj.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/40647824850.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c44fb2d8f87ec85bfb200b259b782952/56213563264.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/42839165500.pdfIn PDF document text
    • http://muszempilla.com/files/file/65099291005.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/rinewesomifutapirogef.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/64534657123.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/wifuvafanuvafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+download+onenote+for+windows+10PDF 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_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 10584 bytes
SHA-256: e52bc1a6721bb5bf888a965d26f3ae38e48c1b847a9b8641ff92615f16737778
font_01_sfnt_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 16876 bytes
SHA-256: 50d33cbc3ea43a53b95d724d7296c4b81ea57d78793a496dfa743e18ab16357f

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