Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3767c93d584ba26…

MALICIOUS

PDF

85.8 KB Created: 2021-08-06 08:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98ee9b43a60957946cf40d823df492c5 SHA-1: 911f2a2b6795d09dd04202beedc418bdc0e16c1e SHA-256: b3767c93d584ba2645cb567e7bddcd47d45184b900513593c80034e4f99dae2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe38976c7d---52838245637.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/akas91l7664kftknl69brb7rv1/41769942395.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8or4pmuoq1gs4kjgjmo2sno741/redorobuvibekufozibum.pdfIn PDF document text
    • http://kbchina.de/upload/gojezuxisapito.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/03dc68def6431d177892323531f00469/tuvegomapo.pdfIn PDF document text
    • http://cartopack.com/Images/file/90433678521.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tinumusuxufoka.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4031f2228baf05a6fc3b14e7979662c1/65947463147.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/500d4946908df13b50e41287351a106d/miderokororoxomerizo.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/82103784604.pdfIn PDF document text
    • https://daismene.it/file/58297149381.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7a9509c5---44193658434.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/498ce9d582e2f9e67429cb22d91c6b97/zovikopigufube.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c00c01b17---davam.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4ba08864---27422225579.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7818e662---5238788753.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/70756880723.pdfIn PDF document text
    • http://mextro.de/upload/files/85270357087.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/95516488866.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/nurarafawib.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/2012591c5bbba4d4493e73da1020fa96/zoranepugada.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/bekavatulejubosekowawok.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/fezijifosokikoxozofagutov.pdfIn PDF document text
    • http://vce34.ru/attachments/file/76907849085.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/rusuzujuwejajapepititi.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/5003865197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pradhan+mantri+awas+yojana+form+gujarat+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 11200 bytes
SHA-256: 6da0cdb818731255be02e26a1c153e8379ced5fff257ab6cb3955b93fb9744c7
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 17264 bytes
SHA-256: c060f5b54219f14e00754137396512a0a180950eeff98a09d1409fb5247c760f
font_03_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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