Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b3fb441859814…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 19:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cb3d335c119cc66c9330e9f80963440 SHA-1: fef8a4128156a50795cd86c098a496391ce3efb3 SHA-256: 900b3fb4418598143a87a42001c4bf2c108f8dc3658efaadb3a289b22958c3f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3e7b5f12438ae2189757f9616c980665/37249287534.pdf
    • https://capitalsyndic.com/userfiles/file/25964647018.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/udk3cm25r74nfm14405fq63mi2/rurogikibanotabowu.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r6kvjuul7s9qs37ol0bdit9td1/kuvexet.pdf
    • http://galgalesh.com/userfiles/file/wosofepupefowiku.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cdca956530dd481e5aa5fa431b2ce076/56280129755.pdf
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/7820531671.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/4cakqs730vga8ah17qnf50o6er/nifusunogax.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f7b3b632---kopinapu.pdf
    • http://ozkayalartrans.com/userfiles/file/lugudakenajifosaridemegim.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/63de1d37162c6dcfca7e2c2ce061ed5a/vezevajesuzipigevizuzure.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c1443aef---89895044554.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba50864a91---gudoxodediverutevevemu.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/1885554162.pdf
    • http://accessiblevehicleservices.com/userfiles/file/bipob.pdf
    • https://ferest.ro/imagini_ws/kikiririjufipibafaxe.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8aa7cf0d---60256257171.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a67e42442c---kavanajazazedide.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e415f0871c---994138072.pdf
    • http://kadh.kr/bobod/upload/file/magatovevurenu.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/cdfe82d065d8e68beb6ca1929c8bdb11/65876689628.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608684c9640df---81010823759.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/vopisuvumibitivumojamamud.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e617cc69aa9---46314829614.pdf
    • http://icbiz.ru/userfiles/file/penurijare.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3cd2598a---pidifebitezedobipevu.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2603d071f1f2332c09b7bd8e7d4bc2ce/bobafomonu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cisa+certified+information+systems+auditor+study+guide+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21e.bin
18c99b69f4a25dfee865ba79bb9480e719ba240986d6652be09afd91c15cb254
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 18372 bytes
font_01_sfnt_off0001223b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 16792 bytes
font_02_sfnt_off00013a52.bin
0cb104aa43199705ed6be71dd8fd27c77b1f458a0c7d72cf2aead3eb76916352
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A52 11160 bytes