Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce340bf1beebfd82…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 22:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68377598fed888e17dd16a256b89f36e SHA-1: 0999cd5800ee4496e86d4cb461d19dceca549314 SHA-256: ce340bf1beebfd8248d84f594f80bb1dcd92e84995e54bbef38da3f7acc7a29a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://laborke.ru/uplcv?utm_term=increase+height+after+21
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15100e7868---wajesumitolamolepexumaj.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16093723be678e---76197821663.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/geruvamidewususasuxusive.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607412cdcb457---75403966439.pdf
    • https://soudurelauziere.com/upload/editor/file/jurudixowikun.pdf
    • http://mispuntossaga.com/campannas/file/5169948330.pdf
    • http://suacuacuonthanhhoa.com/upload/files/xewikonuzefeleg.pdf
    • http://sosnovgeo.ru/userfiles/file/90582475427.pdf
    • https://hophamthaibinh.com/upload/files/tetaxatirewax.pdf
    • http://liebherr-tr.com/userfiles/file/dobamujofeladujarolilasa.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/uiaund73ec9g5v0i3pe76lhbm4/xerodime.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad21537c3f1---7271144473.pdf
    • http://beerskiboot.de/img/upload/file/38478554434.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958f9a68fe---xogebarujawijofepefu.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160726e8643d3d---46948029566.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff7051e7e---41070335260.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503052525479031.pdf
    • http://bpabv.nl/uploadfiles/file/13985298555.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee3497fb2---29050517476.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c7b47fa18---34956441685.pdf
    • http://diamondsnspurs.com/clients/12200/File/fabupelisujelodi.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3b4ec38e2---xaduzevadoxusitap.pdf
    • http://orchid-daikanyama.com/userfiles/file/pupowakizoxinadewofakumud.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bd31e902---giwuvamegumebekadobo.pdf
    • http://gazosilikatnn.ru/uploads/files/45676997206.pdf
    • https://noihoithanhtuan.com/media/ftp/file/dinukevegiruxakad.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807dc3137ff---40994089133.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_off0000fcfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16792 bytes
font_01_sfnt_off00011510.bin
1148ae5f4c6bbc1f15c9bc78660fa7ead589aac826440d7204e464bf81e8ef0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 17188 bytes
font_02_sfnt_off000141d6.bin
866053c080fbd147b741c0f229de706a10a6783c0dd7f276e16f877b4c1efdc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 10572 bytes