Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ced3ec60b202ada…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 01:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5109d59641027289f6ab555f569511e5 SHA-1: dd0ad257853b8ee47f1c3975f43d71ebb19c6930 SHA-256: 8ced3ec60b202ada79c9dd1b72e7e30a73df29a524dfdd899e46b9446d8167ee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress installations, likely intended to host further malicious content or redirect users to phishing sites. The PDF structure and embedded links suggest an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a254aef58d57872e65302e78cbe0ec4f/kejupifef.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815dfad81e1---80913676746.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cf93abe0e77---78816730636.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096825380ebc---foradubudunivujilunaned.pdf
    • https://adsbudget.net/userfiles/file/17562176111.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20406026485.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/75106327461.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e4ed146bee3954bfe0cff6071370ec3d/79640591946.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p1fdig58a9h1ckf507um3p60eg/valavaxanelunilo.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/danilasupaj.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c26b54f31aac46dcf624c49fe1b13241/58709903103.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/01ebvved1u5h3p75rsnnjh0l1s/zojatuzusamopowamawotoki.pdf
    • http://collectifff.be/imgdb/accueil/files/11553864784.pdf
    • https://airflow-skateboards.com/upload/file/duxusasugidubisub.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160842c9e0973e---guxoxaloga.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba6766f81---fujubuxenunod.pdf
    • https://belloverde.net/emailer/file/noxatupaniz.pdf
    • http://ahcxdq.com/uploads/file/211022274950.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608705e70c476---34113196511.pdf
    • http://naturalmis.com/userfiles/file/wexotivaledorotezemewix.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/9d72f1f37db9a65076879ee7b5d1764e/78726687971.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21a531fcb---guzetovijemugidubatow.pdf
    • https://stallion-international.com/userfiles/file/jazelomulojinejor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=solve+linear+equations+using+elimination
    • 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_off0000ed49.bin
def803d74afbc439ef7c808f0d11dd1a24a11743e6e148692257d451088c00d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 17336 bytes
font_01_sfnt_off00011aed.bin
0e26571d0851e866476834fc583369f0287d24b01e654f2365ceb6be8b4a253d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 10836 bytes
font_02_sfnt_off000133a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 16792 bytes