Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b5318d3dc6236a…

MALICIOUS

PDF

98.7 KB Created: 2021-07-22 23:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b4cea6b90584da9a6f29da07fb17012d SHA-1: cbdc91e4e1037b3edcc12011a695b50874099a44 SHA-256: 72b5318d3dc6236a96df6fd254fe9715e7d5c9a4f6d884d24be5a2e15987a493
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The PDF structure and embedded URLs suggest an attempt to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/09113c7b907d016e365d9f2436ab8fab/71261112492.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836686bfe9d---xikosuguviwavafidenufapip.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e4fa99b3481efc1c0e5f0bfdc00d5daf/38888620507.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/20946332180.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/87770816872.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/jevokulodejonetataxotiw.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1f95duq6acp406jfphhuk5cbve/71703398104.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f2e00b4b---rijajosapekasumo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6afve60blq7l2j4k0knqfav1a3/kalajatefowuzumijifisulu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/29889970393.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/zarapudavevugawef.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tshnpeaa5v56krb5h39ignjhv3/saronitenafifufiviziruv.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sr0un9qiffmv1ue8tb79v3u782/rejidalobotiloxalizogenu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2e957982e59b23a117114a230451fcf/badipovisegaluvosulebuvir.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/80809533667.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/87736750730.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/forexosulumimada.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/2374818610.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6d3195d81e533eeb9f5108da9045eb09/rumirilamobax.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2db1cb83---3091027769.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0203e7cad2ad7f4ee75d0a3ef04e1e83/82680331738.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74cd895a6---79622830064.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/c55qrugrki5ik73j3kgfm035e2/tuzun.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/16564979313.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11fed6c4f---83606606547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=easy+general+knowledge+quiz+answersPDF 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_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 17868 bytes
SHA-256: a802ec63ecd5b4eebe9800f04e622ef09693c5dbf6b28b861dcafc5f7d8b64c8
font_01_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00014a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5C 10904 bytes
SHA-256: e262012248f401d4abb7470a47a3cab2be01aaa5131bd700fdbfad2bfe8a6536
font_03_sfnt_off00016343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1