Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2f55f846edda43…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 19:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9a659ae562d0316fbfaeaac1488e658 SHA-1: fd2a80b59fe8918270d472f5cd5ecab2ea393012 SHA-256: ef2f55f846edda432a24e1f87f81fa767ba30013d43b668ae47e652ac730fc22
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and compromised upload links points to a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agroadvanced.com/app/webroot/newsletters/editor/files/zejomubijazerudefoz.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fnhspurqmc1hb5k71mj3ogrbnf/xisuze.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0f6d49ea53038244b4883787c3bee2c0/32450159481.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/37111208484.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/88441207481.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/zetobowirijuke.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4996d0094---23921024119.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/49693595660.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lonomizoli.pdfIn PDF document text
    • http://e-sportis.com/images/upload/noluribizogepikarozija.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/nojasagironojevaroz.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/pizasikokonapozowaki.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ab2f5e2d67c8c193db9a5327c500f01c/kewokajed.pdfIn PDF document text
    • http://hanauhrova.cz/files/rajofuka.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092006b3d705---20461817413.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/wogepebivinodivuzakob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b543321b---79650945945.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608712877d2c4---tunawefopexo.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/dufavudezukejimipe.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/41cf134445616ff84b5ecf20254fe5da/89269011826.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/47415120034.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e1e3ccc1---jimusotimaxo.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/eaa5f80083209a0ac15b19924c4bf7f6/80281185172.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762d7dea7a1---33476949707.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4umi91sc2bda43qgvnk57p0ks1/suzoturininugebipas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ecological+crisis+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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10444 bytes
SHA-256: 5812607c91411ea89853ce9ac65147d538c6fb4c4b8650adea4196da6c214a0e
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 17872 bytes
SHA-256: 4fe79c679db28011e398191204a94fec775f883f1234fdce45b1b15b95a42eb8
font_02_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1