Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35b3fe23c7d1563…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 05:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb04a0f2dbeb003d84c5ccf2ee2da0a4 SHA-1: 42731962f0fc3706bca2069f95d836aeda178100 SHA-256: d35b3fe23c7d15630146f285d6871bf83f5c54c89f0103542479e2720a952aea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' identifies a lure impersonating Apple, directing users to a non-matching host. The PDF document contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=outfitter+near+me.
  • 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://falerisztika.hu/tmp/zexolisodedipex.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/76769166995.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/51568572784.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63c8578cc5---miwaxabasezezowikunesuvi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/a55bc6b5a9cc85fc62f5c7103d2eca3b/zipubogetewopowuxosofetux.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/3731841499.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/silowemubaxageser.pdfIn PDF document text
    • http://dentistturkey.com/image/files/jofopota.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30863719b73ae33afa159850a3efa564/potidiwate.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/didubakepofiverakaxo.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/32800495260.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60b8d986f---82200544777.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/89312587116.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210830_8C59508F24BCE016.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/nisodipipawa.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xolufobawu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1d8b695ec97988af6de72afaad08a609/rivasulenapude.pdfIn PDF document text
    • https://avflash.nl/upload/files/85368170237.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/wokatagopanazexesa.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/86195609639.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/23739566739.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/13942353586.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/57992277302.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160781ef3c24db---goviwezafibaxezoraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=outfitter+near+mePDF 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_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10168 bytes
SHA-256: d33be1e97357e2afca77e85ec88c956c5504163c776872d5591b0354dd1f896d
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 17444 bytes
SHA-256: 4ff489d919c986ea011948ede5674438530029e3bc90b26f8fb23b794b580b16