Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c738b2970f3c5e…

MALICIOUS

PDF

116.3 KB Created: 2021-06-10 14:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6269826d7882fee3e0d6e10baea088d8 SHA-1: d701db80037f90e394cabe0c3a7599d599b97832 SHA-256: a1c738b2970f3c5ecaa00c885a56e3534d7b7f449361e230fa0d69d7b68615e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=shiva+tandava+stotram+in+sanskrit+pdf PDF link annotation
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/6jg7jhv7dto3672c65da46b8k5/satilowipikadufewimigijot.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/vefinusimirarup.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4qqbtebv1c2hgumfntr3gora37/refuwovowiro.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc535ab97d---melubuwa.pdfIn PDF document text
    • http://atomleasing.ru/media/File/84425406612.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/67599718792.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/tevikezeraxogifur.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mefozap.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b90d6bb1---17554548188.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/35988620983.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23e3a2126---nirunukolugugalitevekar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d01026448---19565842912.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/3234198341.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607241b1eba7d---bufanazefufumujime.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084023f6bf31---tibirazuwanetute.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00018213.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18213 21784 bytes
SHA-256: 802ba2a9b172f259817dd04ccff9ab18224620503eee4ba2e7c97ff4fe802eb0
font_00_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 5144 bytes
SHA-256: e4a239bfba74019585c65cf2a1f7968f290e86e97f01a6f115b0404a7b0a032c
font_01_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 3772 bytes
SHA-256: 4cd60777e265fafd80a6c4ac8a8f541642313e2b1c6670a3899fdf55b12f51bc
font_02_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 13384 bytes
SHA-256: ec79cb4f9121cb92d577613f72eb828a60b4174000f4bc4ae4cfbfc853d8a132
font_03_sfnt_off00015ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA8 16228 bytes
SHA-256: d5d85e3aaaa5992967d3bcc314d74791cb71fca714f8331f5cf69889fcc7a56c
font_04_sfnt_off00017412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17412 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2