Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c78d7650068d2d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-14 06:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07e480c3c5c169b216a770f1a24fdfff SHA-1: 6506188613bb9fc145aa5f185dba7b98900a8383 SHA-256: 57c78d7650068d2d2ec9739e384255ddebe29240e8388008d44392101cbbe68c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan delivery mechanism. The document's purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b95dcbed4e844c5ea41701a2f7dc0be8/46359443162.pdf In PDF document text
    • http://mobydick-band.de/fckdata/file/xifafogokugirimeluji.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kisitugokubirukafol.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e52434b2235---xomul.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/riteruvudenibel.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a5b4158f---14784720409.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e07eee7f---28949015445.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/280285c45823ac68b7542a2f71c1a581/32218845472.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/xatati.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/94616008227.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/88107011006.pdfIn PDF document text
    • http://ubest.ru/images/file/lesapa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629bc1e3db---xaluwigitatuketosotav.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/61405425085.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b7556d5b4---12259730113.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/8516929109.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/74917174506.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a56808d3049---kexijijabukawovujitafazu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/momurusevibefogezo.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/2695737991.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/60523161957.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081adb27736a---rorutikop.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/riramelixuxaxoxenage.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409518f95d---sebex.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/9707109053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+crossing+mccarthyPDF 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_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10708 bytes
SHA-256: cfcaca2626490ca9b0047260debf4629806cb95d24cacc6067ce5907cec62a54
font_01_sfnt_off00010afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 19164 bytes
SHA-256: 474452722cf8921c8fbf2349d5f763e9ea26ad28ce99340b567cacd53cee60fb
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1