Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a0aba924940b90…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 06:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 840aa02a0ce15515363c6d4a110c77d7 SHA-1: 8efe532771a9dd00d6b618592bf4ffebd1a7e336 SHA-256: 25a0aba924940b90a523827994d4baac824b561eb55595ba5f1c2a61bb6f49be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely directing users to malicious sites. The embedded JavaScript suggests an attempt to execute further malicious actions or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://nothingbutsafetyglasses.com/userfiles/file/76732357710.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xaxutimov.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4e6241c33a9648d305d3e61a239f571e/dukisazivumazalixegademo.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/41632856775.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7accb13582---xezitoxosujaxorirakena.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772dff51a51---kapasute.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/55943792087.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9f25dae32b1615153cc6cb127825df15/sezutexusukewegusinufudef.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/98067426306.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/teboxo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/51682048614.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/talate.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zadufotulifu.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/gawavebadibisud.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/lolezigenemanixixow.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/fenotovedagagobomu.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/nutub.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kaxivawodeda.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/kobemuxunekotigesodewufa.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mumomifoxisufapu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dozebesufade.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/93726129551.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/41914477730.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/99862236562.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4676b7eaf35bfea7b5436817c4360272/28796427688.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/84195648891.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1r2umq1h276d6n08nl4hml0v54/lanub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=my+face+skin+is+very+dry+and+roughPDF 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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 10976 bytes
SHA-256: a346b84ac703c94a93e792013be10c789efc148e30067a2a48ec80311866423d
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 18268 bytes
SHA-256: 60445e1060b0d6238dd6847ce5223ef16d490ceae11bcd0df9297765852d78d6