Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c7b2b585bd8f7c…

MALICIOUS

PDF

89.6 KB Created: 2021-08-09 02:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 808563ed38a501812c946686620a3154 SHA-1: 33f3ba2d0748fc75ae11da1035eb730d23dff956 SHA-256: f9c7b2b585bd8f7c62322b0cd42ebdf72ed71a23104551b18d1501b0e52dfe37
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://candleelectricals.com/uploaded_files/userfiles/files/zemigiw.pdf
    • http://lsneotek.com/ckupload/files/56352109601.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f2c4365142d837eb34e391bbc7e98186/54903990849.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/23015tf403rnt2ubljfiebihhi/1847985834.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8de917dc1c---volaxuzusabelubetalixujup.pdf
    • http://ketnoikienthuc.com/upload/files/gapiwoxatapeseripud.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/asnfdejkbrviq9pc9bechv2qjo/bixusesezip.pdf
    • https://kingdomdatesuae.com/userfiles/files/sizawujutimobivusubuzariv.pdf
    • http://mywayrtk.info/userfiles/file/mukotilipanekuzozaton.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5cbda781aa5c79fa1e3486ee6331a00f/xurerakolikaperadapa.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6caea588f---fabozapikukasuzatupo.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6774dbf50d---zesijomigigakolur.pdf
    • https://manuscripthandler.com/userfiles/file/nidalidikinekineg.pdf
    • http://girisimcilikproje.com/resimler/files/29474253788.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fe596df0c2670d9b51b415053f7316ce/83145513438.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c796010b7a4---92529273049.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa50e9359---rozokulakatagafef.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/51702333794.pdf
    • https://mszukam.pl/dat//file/jusabusofafuwupogopepib.pdf
    • http://mousike.it/img_ins/files/kurawowasuk.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3ec5de37---sesokavorumozewudiwiferu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oi5849q70vf7e1nrp69gj8p1lb/somisojetujojalimolobiz.pdf
    • https://tort-art.ru/userfiles/file/36834745329.pdf
    • https://arerp.kr/data/file///maripij.pdf
    • http://worthingtonpark101.com/userimages/mutazuninepedidoxamabe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=periodic+table+of+elements+symbols+and+names+quizlet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin
03469fcf1f318a91696b9f04e38321413235e86d822f7b9718a05fd332c7e986
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 17472 bytes
font_01_sfnt_off00012523.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 16792 bytes
font_02_sfnt_off00013d3a.bin
f854a357d4c90047e7290ef8f9bbbf8158330434d4aca403813f8de2cd4db69d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 11196 bytes