Malicious PDF — malware analysis report

Static analysis result for SHA-256 500dfece76211ef9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 12:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90b939d9d8ec2cd9c8bd9b1aa086b288 SHA-1: 9135548a712d6ca04a3bf4d5d7e8948dee6d2a88 SHA-256: 500dfece76211ef917b79eb8c8b989c6b01898f91009059ad4f67108b813092e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d9d3d2bb---32545883858.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/26418644805.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ea8e244def71def4f5043c9a2065237/xiduzotofelopexijogif.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xupipurojek.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b43363b---mideguwin.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511083612438.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/93e7f5266886f356382f5d0a3cebf9bc/87706748360.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gdjjqhbi6flmurvaadi157ops1/95039229861.pdfIn PDF document text
    • https://tappowine.com/file/87321423249.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vuzotafavokuxopivebiz.pdfIn PDF document text
    • http://esistore.de/userfiles/file/97147607469.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/putaredilofepibilimavozor.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/37937131371.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a283c53b2a---86450901484.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/wamininotubivugafubu.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/16793498386.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a050e47ad97e7dd610b5dc23c0a6d00b/91556123740.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/70222772469.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/32751623631.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0c298bef502c61ac0decb42789095640/45279572991.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebded22e1a---39146011917.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/82542396947.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f28c19a7---lawabigirava.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b640f095938---sukepudokez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+stretch+shrunken+clothesPDF 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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 16416 bytes
SHA-256: 96f047b71743a8eeae66a35eda541bc1b0ae9d9be299c280d564654507551e1b
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10340 bytes
SHA-256: e7d9da0fabbc73e4fcc1c9f1f58f940a72937c1ea9f0efcd8353ce86a9615c39
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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