Malicious PDF — malware analysis report

Static analysis result for SHA-256 849f7ae8b5ee970c…

MALICIOUS

PDF

73.9 KB Created: 2021-07-20 03:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a0eccaf76990b4b5a565afda243e717 SHA-1: 267e2d53f3dd110016c7469f8dd0054c024ef678 SHA-256: 849f7ae8b5ee970ce66c51b1337d9437c674550f3a30f3f29f2a3b98c016bbb2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the nature of the link farm indicate a likely spearphishing attachment or a client execution exploit to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cad121dbdf1f43e86b4ba147784a34a3/60973161248.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6948e13b---zukirenaz.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210529205239009.pdfIn PDF document text
    • http://chinalabware.net/d/files/bukanuxato.pdfIn PDF document text
    • http://lg-palette.com/upload/files/63131367392.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/97201587911.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/53390494928.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/89082935125.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b2a0793adb4.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/45f7ec208b1ab36df7e6327d51ccee76/61415244727.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b13dae51---fegavaradezoxiranedo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c892b30969---bojelatolesirijafuvarodos.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/34a3f7b9d4040c75b38ff5fb0dffadc1/49146874032.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/48408451309.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/33721336951.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c457f95b9c---12497308217.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b4953b69a2ad707e8271b7f22a21c96a/1315809549.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609152e95aea9---45310614564.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2da7521933---27871769053.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/30507403705.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ftqau0tb8nlco4b0edelhe7h6n/57842477706.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/97065877603.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161654a250---mamibun.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qqmmtumn12tpl43fqvt95vh7ti/monitedenigonopew.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607366efa0b83---noxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jackpot+guessing+numberPDF 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_off0000be41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 15988 bytes
SHA-256: cf2bd975c7dc64cf7ff71eb80d93f537a4a41cfa0e4e3cea922b7f82256a2df8
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10996 bytes
SHA-256: 206da0528da91e40705bc4f1de3fb26fea1e1b97406be4e40716df7ab1627d7c

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