Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba7c31e7539c8ea…

MALICIOUS

PDF

91.3 KB Created: 2021-07-03 16:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a66fd9f5ae366a908ec9db8212f5a33a SHA-1: 5b2c2f921f050722cbd8fd4a3f55a59da0255661 SHA-256: eba7c31e7539c8eaa114dd31a70d2c9848143e34d51e5f0f25c8e86ba2b223c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of external URIs and link farms on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989eb456f4d---riwej.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9du9uheo9tnujmbekckevifr3c/goxagigi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bdge49hs9imgujjfldvfevrlf6/xodevaxojulorotagafapi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///taliv.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/62307770406.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6simrjfcnpid019dgjs58b4qso/batebevotukikojuzan.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/54015469793.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/jekepejenomova.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f8668e639b839420e348f8f6c4b1c571/mowalozagokuparetelasowen.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a9087a31---17889808002.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/83187150704.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jvou68mslul24kjqa5ukvu1lkb/gavajuraweva.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/518222674.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/mamew.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f06cb41a0cd4e3cf3e69de14b4ef82bf/womezen.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6800987630---20414920259.pdfIn PDF document text
    • http://bio86.fr/fichiers/47371714394.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160762252199b1---32713859735.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160988cd628161---48236932653.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/jukopu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3fcd7d6f8e22413bbbd27e132ac7f8d4/simakopubojobanawemimibab.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/af5dd01daa3e44826229fb3bfd132ff7/27298700068.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2a381dafc83def8145a9a77e5bf97a20/namizoxijisurevas.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/adf821b68fda4df5bab89c39005b7b86/reguki.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/napujag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=prove+the+mid+point+theoremPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 10348 bytes
SHA-256: 3aafe5b6487ca2966c324d90fe4e6e233fa467aa33fe2b51c2d7df96a1d10a3c
font_02_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16284 bytes
SHA-256: 3eac36bee95a31f99d46f8f122d2b7687614fb0ab8bbaf42018ff8c410e97643
font_03_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 17880 bytes
SHA-256: 954063b60d69b9893c4d0ce74b634ba7b6d5a81ff8069d60816a22d7dae42577
font_04_sfnt_off0001558f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558F 1676 bytes
SHA-256: 08d3d5576007ac795ae6719f21099a96d4af1de6057acb6b0f60637119274493

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