Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b4d122d2494356…

MALICIOUS

PDF

80.5 KB Created: 2021-10-07 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36b6b00e32d64fb43716fbde9f4141bd SHA-1: 874dedb666f6851f95c820b7c57390ae3aa27d56 SHA-256: b9b4d122d249435609849a1eb8f0f04ced1e39517408fb4c02f1538bdb6eb59f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, including those hosted on disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zaun-produzent.de/userfiles/file/zelaredizipazizir.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/zanujilatatoxedis.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/99909607129.pdfIn PDF document text
    • https://rintrans.com/files/vosigi.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/gevewipobipuzupuxefu.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/51436748847.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb89055b77---zapanura.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/dajawo.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/67681133680.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e133378391---93470364371.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20211002161035.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wafeduvurusinosaduse.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/mamazegu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/dunavosafapuxuku.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/demim.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903234607.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/38881415462.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ddfbb7ea1a1281b949cb343fa8ab3d9c/67435943317.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/viboropixumojobe.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/85229913003.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/96276226410.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/jovotasu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/tuvoguvuxidodorulifufije.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/8702465596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=direct+and+indirect+taxPDF 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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 10132 bytes
SHA-256: 3218ea0534fab64b97b588acb40a1223f08cf49f7f167d3cb23dae5d88391b7a
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 18584 bytes
SHA-256: e4eff6558bda068bd7ed6b98843a8c8a041dea1d2efe38ab7cb0dcc84436acae

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