Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fb2d681ba7493f…

MALICIOUS

PDF

95.5 KB Created: 2021-07-07 15:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 19c952dbd7f2bd598e74bd0f445c4c41 SHA-1: f6715f4a77d0296c4a42c06e6e49952fec2b5614 SHA-256: 04fb2d681ba7493f5c06e7f20ca07f28bcefd91822dbb6105aa2ac0ffdcbf88c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.allatpatikapecs.hu/images/file/24442624481.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623031922198.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/furuwaduwifi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e429ba712---1580630115.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdff82191c---88457669428.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/vazekowi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d128cbcbc3---20061363355.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/renunaramedoje.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/24817639542.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522155548914486.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508231919687753.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b2e9c8353e0c1a12505f4a3796d00a45/7361779006.pdfIn PDF document text
    • https://norservis.info/files/files/57848939541.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/1019319978.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9ee04e7ab4f6269d633ad4637acca627/54119417455.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/zenosefevirapifot.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/89411213833.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/77d4717a3fa9a39c0e36e2878709a061/64772440599.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cd2a33a8e8eca14b5f3d8c8f7e3744aa/viwimosetula.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/rujenugona.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca05d395a24---wajobasalevosumorirog.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4e1419c0496fcd852d943961e749b0d5/38303994636.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/limakujapozepuwanezeni.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/20982457867.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ef64e047---3724478506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=picture+in+the+mind+crossword+cluePDF 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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 17884 bytes
SHA-256: f65c30f8cfff08cb33f6e3168f50d8bb9ded46fc6977fb3e4e1b1e1a50afcfc7
font_02_sfnt_off00013e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15636 10660 bytes
SHA-256: 734c86a78c53494b36d9a6584806e5ccfdce3b012111415ec765d8bb695be5b5

Open this report in the interactive analyzer, or submit your own file for analysis.