Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7560df82d9646f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 04:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 937f2456fa59bc71e0543e3d422ef980 SHA-1: ec2f954d13b554db7a1a6f90cb9b9fdfd49eea5f SHA-256: ed7560df82d9646f93fc9338f8401fa366b3b2af9e37edd0887ec2646b49ff1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The numerous external URLs, many hosted on compromised websites or disposable domains, suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=convert+file+chm+to+pdf+online PDF link annotation
    • https://cncunse.com/d/files/fenojofejojojubavilav.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/75767072014.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/61186136095.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/dixunanos.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/tapelizuzoduberetamo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807c581cc5---vokenemunedura.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/573137d6da9833cc83d4c670413ea0dc/kebedabulufe.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b39f66a9bc2f1413749ab258f0fd7f2f/dejebelupiterijijafe.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16106f360e1269---64211253119.pdfIn PDF document text
    • http://bankerz.in/qpic/files/89495049622.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2qf9m467l033n62fji3ph6sal1/tegewafenogudozapita.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9h5lqms2p42rmvdh6j387kqf52/sagovofovanolezexo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe0f1f0e3---leruzodiwebapefif.pdfIn PDF document text
    • http://svx.su/ffile/file/53573426824.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/27074111981.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/sedirep.pdfIn PDF document text
    • https://defi128.com/userfiles/files/60627254709.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/sezilafalasiru.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/88535653301.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6rbtj7e3ke25tr1pb5g7rlquv4/90715646840.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadfe61073a---81603918120.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6acb0163---69620431947.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/418905022.pdfIn PDF document text
    • 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_off0000bfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 16164 bytes
SHA-256: 0a1a26d1554305780f560768913812fc00feb049d314b7398ed6bb41f13474fe
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 10652 bytes
SHA-256: e3d09f8435735635d8dc1f3419b9866441365eae05e3384b124cc9e8af9d03b4

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