Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf4bcc905a0eaa8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 07:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f201a33f0b181968b5c7f80faf05f96 SHA-1: 572a5c6e86daf0d4a12912a70188045c24aa74be SHA-256: 3bf4bcc905a0eaa8018883c6926e896767f10035d4314ab4f882f97850acc39b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735815b1479---jananubopesejakodum.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/44309384188.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b909ae044---7452669025.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vesodel.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/29402491900.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/10739663993.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/beparukunanuzelokojafux.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/11207663934.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/82426338088.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/48002769488.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160846893ced19---bokexudojaxulajifas.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6406239a75f691b1907286884886a88c/nexixogadekevenojozi.pdfIn PDF document text
    • http://adepotcustom.com/UploadFiles/file/20210430125422148.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bf0640954cbf607f8fe5e79464915251/25814931940.pdfIn PDF document text
    • https://tdfstore.it/file/68144153300.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/gamusuzawosevowejalebim.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ab96f6457b0ba576a8f8fd52bf273dfa/44480724942.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ecb781d35b8f8fd6078311e418464be/66883417148.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/fitegowobuzawafapax.pdfIn PDF document text
    • https://samowar.ch/upload/file/pufinakevoremuxow.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/70264436884.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bafd899342f3d4927519be4c910b9559/navosoripumulewivaworal.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vuvugoselosubezesav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=makhzan+ul+mufradat+pdf+free+downloadPDF 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10832 bytes
SHA-256: a32cc491606b243790f6b7190ae4c93e6a982b3d425ead64c0e65ddf7885ac78
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 14040 bytes
SHA-256: 2f1422951d2c36d29821690b32f1e3fbbcacb3ac382126399f058c121caa56a1