Malicious PDF — malware analysis report

Static analysis result for SHA-256 745c0f6d0390f967…

MALICIOUS

PDF

77.8 KB Created: 2021-08-14 17:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e484bc1850f8a21f33c0b1735d902785 SHA-1: d3d5e73ad6fe3c620cddd1c3f45294f729a43065 SHA-256: 745c0f6d0390f9672d8c4210cb17a5a2d999084c908dd194aa8bad66deb94815
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. The presence of numerous links, including those pointing to compromised WordPress uploads and disposable hosting, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly imply the use of embedded JavaScript for exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://goodwill.pl/userfiles/file/nijerazogubesevomopiwexe.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c1a43601---sogixujawopozenejud.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084408b8d8f2---2514103594.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f6nr2l1vddp8bi962irtplieu8/sejarirakubu.pdf
    • http://suachuathietbi.com/upload/files/53526133696.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/13107277706.pdf
    • http://fotocaroli.it/userfiles/files/38016060856.pdf
    • http://vimar.ua/userfiles/files/58529592175.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b7891311---11060382079.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/cmphte7rbfau5n2lf7hvt01dc3/32237878374.pdf
    • http://refinerlink.com/userfiles/file/fuligefararox.pdf
    • https://iveducentar.com/uploads/assets/file/kufaxibaxikekupodiso.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801a973f09e---12949752512.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6h38tdpplnt9cgo3da2jbval2s/86683726922.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fae794772---74259943387.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/n4rq6rmnk9k1kojatkeipd94b3/feradabav.pdf
    • http://aven.su/userfiles/file/mometogakozumatep.pdf
    • http://autowassenindex.nl/images/uploads/gugepejetiwokozom.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3e58a3d6---56717520183.pdf
    • http://ahkjt.com/upfile/file/bamutelopufudew.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g3s14hp923pkfe9kes52jisifj/37614517313.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be5fcab2d---44777103089.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3638b2d5ce---labotewa.pdf
    • http://deforma.it/userfiles/files/34219291656.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=alter+ego+a1+book+solutions
    • 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_off0000cc96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 16792 bytes
font_01_sfnt_off0000e4a8.bin
b1a4b54f9f6be4d3ff3fb74bf234c74f36cc57c0e5390cfda5ed506bf11e165f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 17312 bytes
font_02_sfnt_off000110ba.bin
9b21301182e5279054a490f4db4cb317ceae0d0474f34b5bb726b8beebfba79e
pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 10648 bytes