Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6b0090c1ce0233…

MALICIOUS

PDF

85.2 KB Created: 2021-07-14 02:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0bb2eace6478382139abbd0e33a392e SHA-1: 1a5c8170fecceb07a2d82ab5c1638705cd4b0388 SHA-256: 4e6b0090c1ce0233ab3dda56a080b1e99c3e027341dd5dcad220b4256bce5d02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a940046e402---7906599482.pdf In PDF document text
    • http://klinok-saintp.ru/files/77793117695.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/954226a71bfeedccb4230c041ad74741/48256740792.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/lugilalavupabodelo.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/mumapijejutozozenaj.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/9477941985.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/55137123978.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/30655976909.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/47013564837.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/44314488848.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210516214341.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/95928342601.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/kegapodaguboxowawavet.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a250d2a2233884840738d96fbe35cf69/tujimixomaxif.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/aaf68a14711bc07236f9c9da52db833b/gifisexari.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/81689966593.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/m3o4fahpuguboqltgqj2brs2os/88585363431.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1tubaua725j4j5c6js1dpf673f/pirurabefafegeruvijiv.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/eor547329cjrmoa3mqkettb2c9/sodamevadufelu.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/wobameverelop.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pomtdpesafn1p7k9g9arlibeqm/fijaxudibawetabuz.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/24763853098.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25fc933e6---duzidi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b22d30938---6283777411.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/gozenobizez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=send+read+report+androidPDF 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_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 16860 bytes
SHA-256: b049a1729edd2052de80b0de3b85f37ea6bce51faa547081f691333be2619054
font_02_sfnt_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 10248 bytes
SHA-256: 3e7356b304c819b41f5599b7eb9e42b732542ae0bf2ab9ead301517ccefa86bb