Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4698a93888e5622…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 08:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52758f9d129e90af09abb0f6e4c1d65c SHA-1: f0fae609b60f4c730d5a07b100904135983576e9 SHA-256: c4698a93888e562263bd4781be74f98c1acef8fa29493f122d53a39ea8b750ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ML classifiers and ClamAV flagging it as malicious, likely a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://wastran.ru/uplcv?utm_term=ace+stream+media+mod PDF link annotation
    • https://almuhja.com/ckfinder/userfiles/files/vevosorofonexewomasun.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/vubotawavowetas.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/39658485026.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/dofogot.pdfIn PDF document text
    • http://rem-proekt.com/f/file/xizuxasaxudije.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399371eabdc---216686761.pdfIn PDF document text
    • http://jump360.co/upload/files/20210917020203.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/1643440405.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/98897995943.pdfIn PDF document text
    • http://rayer.cn/d/files/jekekaxifeko.pdfIn PDF document text
    • http://chineseclothingonline.net/File/72190463618.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/pegikezin.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/13560848329.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fc3dd46dd65eac87028007ca76656e7/87580954665.pdfIn PDF document text
    • http://protok.pro/upload/files/61990257053.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/79475172743.pdfIn PDF document text
    • https://superpart.com/files/bubidofurazesekewurameso.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51072198521.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/23727905390.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/55364353478.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/pimexaded.pdfIn PDF document text
    • http://poliinc.com/upload/files/59637858788.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb0dadb7d---naxawitebokezusetened.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/sexire.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_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 10360 bytes
SHA-256: bbd42eaf156cbf43201e78d19b50163b4c231a6622afc86f0ed0dc5ccda4bb27
font_01_sfnt_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 18092 bytes
SHA-256: 55069f7b6a57301d934174667db8d17675ba842b52ad9b18142f635845fe36fd
font_02_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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