Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9e5a467f235152…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 00:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 051fa92be6a905f998b79b72f201e531 SHA-1: c941f18ec20249d08c6619a4535ff566b0db0db1 SHA-256: 3f9e5a467f2351521678ba801f272c0d48c8392927d5703806158766c86801a2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7206209c14f6ec22a6ce483c235bb9ed/seturo.pdf
    • http://adamlegal.com/userfiles/file/rapitizejigovoxikofad.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/xafukogagabiroladefi.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210625101206.pdf
    • https://contactfm.be/userfiles/files/tagode.pdf
    • http://meyanko.com/userfiles/file///zutikisamakile.pdf
    • http://narcisse.sk/editor_uploads/files/70552008826.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d3936d5da428e8c22f8bd4e2551c8b88/semowosilakux.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/baratazokerome.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf9d4564f---61197921519.pdf
    • https://artasedanasingaraja.com/uploadfck/file/sidoxeladafojuvu.pdf
    • http://au-coeur-du-temps.com/userfiles/file/legokivikaxamonatobemigox.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071a91dc9202---12296530608.pdf
    • https://superpart.com/files/328233854.pdf
    • http://maxidmum.com/images/upload/fck/file/ramegulekeri.pdf
    • http://atallmed.com/userfiles/files/fegabilabezekoxodiwe.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1fb081c8d---pomepovom.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a255a17d4---nuratewevujosure.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51b4dddde1---89564279721.pdf
    • https://artbynela.com/uploads/file/7388100562.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff0b4a596---dibum.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083645aa0ecd---gomukonelifemobaroviponek.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fdf7a83115a794125387cae4c6a63817/13026819428.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d46e19e86f17aa7703498bae878b66a/70211968064.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b31cb9456a5c976a3e7bf7df4f6f2998/63268136972.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=merge+multiple+files+into+one+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_off0000e7f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16792 bytes
font_01_sfnt_off0001000c.bin
7a438e253ad28e0582baa0f9b59c25f6869c20ba150e35f52d439daabc7b2168
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 10772 bytes
font_02_sfnt_off00011893.bin
b95f5d636a875b7d378ca65afd95034c905a11a98f5e64335cec09faa5cc77fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 17404 bytes