Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4061b2c5e8e345a…

MALICIOUS

PDF

94.0 KB Created: 2021-09-17 10:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c9819876efbd5de76f5ea5d32578fa9 SHA-1: 4db8a0e12dc28e6000bf3e65b3bb7f947bcba2be SHA-256: e4061b2c5e8e345affbeddd6c198e17f799c3b16e20a91827c169e0217a54042
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lead users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The document body is heavily obfuscated and contains no readable text, indicating its primary function is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beautifulmoda.com/userfiles/files/69280357210.pdf In PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/janufatenu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144257015e7b---gubukugixavor.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/41107315216.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614193863f2bb---31407526976.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7fe90f8b66306df95b75e91507405502/jatejumekizaxujukobego.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/rigozu.pdfIn PDF document text
    • http://onlinevay.com/upload/files/24110697077.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138012e8afc2---rewaxutixerepuxamil.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/kudedalizapeg.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/61244570295.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/wovuzofepubofidekunaxex.pdfIn PDF document text
    • http://mfahk.com/upload/files/61528916788.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pivibofewexatewev.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/94878996502.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/genaketaxivugusawile.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/nifusesoxomunadolilije.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/78534949472.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902040612964823.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/19754975630.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/botapufoxirinulutar.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/kabavinuwerib.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/wowim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a959f15f8---gazemeputosijunapurefu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c459b33156---somoxirunokajul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=eternity+warriors+2+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16484 bytes
SHA-256: 5310218a1ff07cb3081ddc32e6f005b2bdd50a531b8e40b8feaf5a5015637841
font_01_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 23416 bytes
SHA-256: 3361d9ba905b0a1666ccb85c703327686d96825407019487a14519c3b1ef7a2e
font_02_sfnt_off00013082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 10596 bytes
SHA-256: 64264cf9d126e5f7b06a4624d658dafe9adc9bb618639658fcaf464be680d97c
font_03_sfnt_off000148f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F2 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off0001517c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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