Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc22f2953584f90…

MALICIOUS

PDF

113.0 KB Created: 2021-06-23 11:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5a54026630009a84d1f9f2442b1671cb SHA-1: d63d38039d144269f2e606da53adb908c89b6b5e SHA-256: 6cc22f2953584f904a7c46c552c34ca63f2ec7f422306d963422808b224eaa73
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 0.9995

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://jdrum-music.com/uploads/ckfiles/files/25912550718.pdf In PDF document text
    • http://22743333.com/userfiles/files/3705384527.pdfIn PDF document text
    • https://rm-parketi.si/uploads/mokujezesanobodagud.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/20504623027.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a217f7a5e85---nigebasatogupofoxifevi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089f414940bb---92789712976.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5398e560---53618772883.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/85072392490.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/89416930371.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/niveremejaweli.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/98016656854.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/65437512000.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9392bf240---mijofimimujalovisez.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a3710b023bf6b4f2d152633fa6727e16/begukimadavoleku.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/67352376421.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/t4au2t7lc2t2587gem6qto0dcm/56527906475.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7265aa20---60650932272.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
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shakti+ke+48+niyam+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://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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018a39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18A39 14184 bytes
SHA-256: 38996ac85c77cb44251e5bf53d0f37473cc2cce14b6d6b1be4b5ec9c2144800d
font_00_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 5744 bytes
SHA-256: cd2e8eb3a6361289a66da80597c37204d303843249109bbf8f7105dae9c15d41
font_01_sfnt_off00014986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14986 7804 bytes
SHA-256: 15388e43cd00af0634619e706b51aa83437b50791981a5351be6b4249f78ad4a
font_02_sfnt_off00016261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 12840 bytes
SHA-256: 5cce0e726a5c8b41c69f8224da6e34d7eeefb940a47b62bda5749cba4dc0b173