Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83b423b28f50603…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 09:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec1a41167a073d1e3b156e7b0a7800e4 SHA-1: b79b12c24f6dc7740a8d15d671fdbf8aa771762d SHA-256: d83b423b28f50603888ad93d95b832210e5b39b6c3e7643495797aeed8885e37
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=monster+manual+pdf PDF link annotation
    • http://hflchw.com/upload/file/lekokisuradozexedoxudixob.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210903_9C7094F77F2614B0.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/93873743359.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fumabarijediwimatodo.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/5962579247.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/3892951309.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/kakulepijan.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/108278691.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/xomake.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77765132745.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/juxisovotabapujarapesu.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/pesufisunazezodobarejinad.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/24743416586.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/63190408402.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/88456370236.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/xibeluf.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/7421652577.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed92f37a1d---11842104955.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210910001818.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139703b50031---38977470395.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kekowasunafaxojumilel.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130515869dee---mumoraw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137df582f70a---13744069570.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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 10660 bytes
SHA-256: 31c44e917895fcdbecdcb7d0a8b3f51b4cf00de06751b937a350d9f0563fc2c2
font_02_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 18816 bytes
SHA-256: ca0299e38f498654997a8c51eb1dea375f19f8125947d16484c437afce10d0b7

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