Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a82b3f8111949d3…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 21:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c3bcbfc57e35d13291b1036e171e89b4 SHA-1: 12875c00817fce9e3821081944607e34699bcd37 SHA-256: 8a82b3f8111949d36a7847925605d8a9afaee6d7a5a7a93d5e2e930dea556daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://brothers-music.com/ckfinder/userfiles/files/siwebajegasobiwogitevi.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff6cb57a264230171e1a3b3841bc7b73/kirasixa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pb293b31cocbl7r5qed3idjehs/geduzusozuluzafirub.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840231835a---todikazabixuluxaxopifin.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e0ec2d9ebcc48bc153880b94e1e5f730/bupukefedafuwak.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/49100350726.pdfIn PDF document text
    • https://anjingliar.com/contents//files/revoneza.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/rojupinejobiwusu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kqgc7ni3a62nu58tle6cm9sbsd/41198651644.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vbor67fvdc4n2mopcufn54e4t4/judizavofibonefoxezaj.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/riramapipumomokifepurizev.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/510aa9ff74597afb0da50d4efc70e884/35092057742.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/l4td17t5i753ebjn6b0tlqnvin/91761977728.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c987f5c89d---misagoluxebagijopezozuwo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/38761387358.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uo2f7f4fkctmn7temh7bq43bo6/19757863830.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/35564424681.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b89b11ad0---81946930892.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/mefefenotujifali.pdfIn PDF document text
    • https://etimes.mn/uploads/files/75436262570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nice+describing+words+starting+with+rPDF 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_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 17296 bytes
SHA-256: 602d6face5a41333efdde52805916a56a8e0123e1f05fe6d6b9c6d6651e87583
font_01_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 10804 bytes
SHA-256: 59845ed11cb0bd7f67cce085f54eb8ddbb4101d722f119100908f05c49e8aa98
font_02_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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