Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c965069272f6e6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 06:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b2d01e2fdc6c4562ddb0a2d8d4017ba SHA-1: 858ddba7b4a077603224c654ec98260ce8f04a38 SHA-256: a8c965069272f6e67cc5874b58ed6b5539fe373aa20daba575104933c71b19be
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=android+http+request+example PDF link annotation
    • http://ediljolli.com/userfiles/files/xedegedunapaluwure.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/temurexu.pdfIn PDF document text
    • http://4bx.pl/public/file/11218655670.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/21078416888.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/58265141547.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1d867e3f3d5ac760f36afc64e91a4d/pezapafukuwonijezaziro.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nowozadobaze.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/upugt6j6m8i0v9937hojln1ru0/70803393391.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/xeritozusujimulemeviritim.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/kitunifefotuzemewitaxu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a640c4d7f---2577501158.pdfIn PDF document text
    • http://poultech.net/d/files/gunedajidazagidaberezaw.pdfIn PDF document text
    • http://grandfiltr.com/files/file/96617460429.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/3703062591.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/wezinav.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/90106311005.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/lanakuvekekativaxegoximis.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/rilunuporaf.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613594f7d99e5---52227721595.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd2e5de3d---daboxeken.pdfIn PDF document text
    • http://gestioniarmatoriali.it/75521906053.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/lazadupufinu.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/85329614651.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/20dfad927cc35eb8a7b5f827fcbe46b4/mexemojizesuvuzeb.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_off0000c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10984 bytes
SHA-256: 8f124da3b554d289b9412a39e99f29237331bc298ac9c0ee51c4979e138c1288
font_02_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 17828 bytes
SHA-256: 4f082de858be687cd6b0351f5421ca4a93270cd389c43c92a6115b4ab94a77f4