Malicious PDF — malware analysis report

Static analysis result for SHA-256 841e6d3f4c7663ab…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 14:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34d7289768c9d2c3796fc4b7332b6fec SHA-1: 5807f82dec99e2a88c7cf8fde7121078b9af5b43 SHA-256: 841e6d3f4c7663ab908cdeed53c4a17b93714e279a1841216bea34406ae3f8f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these numerous external links suggests an attempt to lead users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=how+do+i+add+a+contact+on+my+android+phone PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccbea7344---pemuj.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/47114662922.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vukipabukusowe.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/52027032079.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • http://hydrem.ru/images/file/ruvukebefefupusuvopan.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/zoxowajadogukebukewete.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0o8nqu5oeij3g72gont8v9s436/puduxefuturaboluzibejadep.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/16474432534.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/70067079256.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/piketifuninisifejuxa.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/49765736566.pdfIn PDF document text
    • http://getdol.com/page_data/file/23874476564.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/mopiboxawe.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dcb34ee16535f42264d99988a6885662/laxibanawupos.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/mazavir.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/42648646431.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/seweronulozeladejok.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wadelebilevema.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0c3ec60a---99714540778.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff916e2ee---59034575829.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/68442288512.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/wederolafuwisuram.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/16821335252.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/lexoxopawiwipusepisema.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/buwarudetuvaloz.pdfIn PDF document text
    • 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 17192 bytes
SHA-256: 4ce88b1de72f6346d807538b808b6999f0d048e5f7fd1dc0cd2700947fb762d5
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 10756 bytes
SHA-256: 93aa554df0f6d159e6d41cb84599e18370787d96aefc4a83567ec18454d1e99d