Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54166d56adad6a6…

MALICIOUS

PDF

72.1 KB Created: 2021-10-04 10:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8d97f2d78b24d8ffa579da96a71b4c4 SHA-1: 1d1897f3aef3b91666548d91b54bb3c076c750a9 SHA-256: b54166d56adad6a6ed5f8fa92c7ba9533a7004c9bd90d377de432a45ad2a1729
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://ifaistos.reality.gr/~triantaf/images/file/takepasijexapesamekuxobi.pdf In PDF document text
    • http://ural-resyrs.ru/data/file/dikuxisitenizoxevexi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/37097363984.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20211004_75BE35B9CE4E2B96.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/difefixuzetefaxukajut.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/7921441329.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615428cee07d2---rujisodedidepewisapije.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/divudexesu.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/poxaraburuvan.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/fopusi.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/8328261850.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/60057395254.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed55683178---luvukoxawepegopelemorebi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/30412252369.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/kajumokozolaju.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/73075823e0d678eaab46e7ec965aeb0c/31623742240.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/limavefevatofe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/122538441.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/levaneboluxe.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/sumijimovibunubadaguzonek.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/pitalabis.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/viredomogebid.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/fajufunod.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092216574173499.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/kuvujovujajas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maggie+grace+looks+like+charlize+theronPDF 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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 10652 bytes
SHA-256: 82104b98d0c69cc4eb2e34a41af59264ac57008f5f1bee0f31f69b82900f27b3
font_02_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 17260 bytes
SHA-256: 68bb8587d0281206fe66f287218b4f9630cde17d4adebb3ec48cc12fe1608976

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