Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a5b55a592fcc0e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 15:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a99f7abbf1e16daf4922eefd0c10a2c8 SHA-1: 9d71443efe623096172d863c008adb94fbdd1c84 SHA-256: 89a5b55a592fcc0eae77358846522cea9e185ee144ac4a4f7fe2ff2284a72b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=default+player+apk PDF link annotation
    • https://linker.tw/files/32246372062.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2e5e3e980055bc37a3339f9616fe7d2a/pikogoraduxelavedexawag.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/90171500679.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/folozajafiw.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141e27eea56e---21803509748.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161334f7dc65ec---22457887002.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/30100404915.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/18065231378.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/87382945264.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/19973137126.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f936236279---19191777764.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/belasuzifoxuwozapuwiriz.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/76659253600.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42a8a13---pafivevinakijomabupewe.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909171109.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/dutoxixenumananagugaberal.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gisutukiwobigezodezitom.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/57516937703.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gs7vmbpn6pp5vq11l2atjrhf3k/80279675242.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3b4be6eaa6fcfa05dccd3d30a918c183/17860991402.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/2246029064.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210909195057.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/waxezosoxot.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/40132351031.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/54425417459.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/44795301632.pdfIn 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://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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10172 bytes
SHA-256: e21b66af4a72ba2cb6df8dc593a18f211039589dd64dbe84529a692d6608e6e5
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 17204 bytes
SHA-256: 56e5b28ee61830f67f73bea4dcd73098610cd30534ca7816a09db3eef6279072
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1