Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5996564af22dc30…

MALICIOUS

PDF

87.0 KB Created: 2021-07-05 06:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e31cce3b160d1b44cad41c071634b6e8 SHA-1: bd63db40ca6fbb730d5945d1df0f2af05ae1accf SHA-256: a5996564af22dc300f94602d67a21fff30604f5a1e57afbaeeecb678dba4007d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://luathoanghuy.com/uploads/files/47627362565.pdf
    • http://agnieszkapawlik.com/userfiles/file/53616918375.pdf
    • http://chinalabware.ru/d/files/5850959738.pdf
    • http://driver-jazda.pl/upload/file/ruzaw.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1dc3ca558ccdc59031807e5bebd21b5c/12046659633.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/gojedevofopupu.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160976f0f38364---18056704377.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a29fa13a694ecb3bd1936d6141c3a99f/kerozasagutiwofesanadarif.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m2om236ckp2j60op4boo28i391/28619600688.pdf
    • https://opsclown.it/ckfinder/userfiles/files/10688670561.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e2da5ab9fa933827a5f4197ab1a256c9/bubomekitunoliv.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b287b0034---divetedebuduguba.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/83673607466.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/2295933344.pdf
    • https://muratay.nl/userfiles/file/gasevidonalit.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c731e6a49e---bisanizebusuxov.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf88af9a9---36019798359.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4704a04e0e---fixerezumisojememe.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c46a2578---luteravede.pdf
    • https://riolospettacoli.it/filesUploads/file/betaker.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/farobofupape.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae27859e73---63013444440.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c30d499a---xelulusi.pdf
    • https://suativisamsungtaihanoi.net/upload/files/jakise.pdf
    • http://pallenberg-busreisen.de/uploads/files/ruwotuwaxu.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/17cad01f70743e8695b214bbd366e112/63712119604.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160901530afcab---26943875143.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=examples+of+protagonist+and+antagonist+in+children%27s+literature
    • 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_off0000ed8b.bin
fbd59242a2f669debb080c4468d0fffded4c7f7dede66f2a45feebdb1a2566d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17128 bytes
font_01_sfnt_off0001197d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
font_02_sfnt_off00013194.bin
ec9c998fe81b9b16827f27e320d83ef2c26699ad46d0d42295f9a535f4b3bc8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 11288 bytes