Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5dd2aadf46ffa3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 08:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8063dc01a5d753f2ed187d915c18a93 SHA-1: 1bd78ee83b8c54dfd98f35b476c43139a2c2161a SHA-256: 1b5dd2aadf46ffa3084a46a2234cdfef7bbc7eb0f02654450331210ffc95f136
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various unknown PDF files hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://antwerp-reefer-tournament.be/argt/files/88477610260.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b5090e1c03b8abf790bffb1b02d01703/xazusurakidijividoz.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/83119469525.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18ba3df29---43165398764.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/tomomu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f27607f2---25150844769.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/retanazagerekanakevot.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/71382881237.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1270e0bd857885a58d78726feaf8803f/gagewesofunirokib.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a5e077be4a0e7ec9f86eebc13be8d9b8/63334890464.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/97392961803.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611b490cd0615---vafumuwevat.pdfIn PDF document text
    • https://12waktu.com/contents/files/meluwoveba.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/jozukufotuvonejo.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/zugupanimapuvofisos.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pd1ra76osdnvlnjhp2iarnmmpf/28150977551.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607989d757895---15451322494.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/96200680472.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sirekevukidotuzajewik.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i9r7r7uf20qpcdnpgv2hb3bdmo/xilusalonat.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19bf8c17e---budakeboluzisan.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108141734395245.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/vavuwevi.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8hm3g9p350j35lt7p0ktm0n400/74608174460.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/toah87drh2906eep4n6mbev606/39457314593.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/15181218636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=normas+apa+2019+%E2%80%93+6ta+%28sexta%29+edici%C3%B3n+%E2%80%93+descargar+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 19364 bytes
SHA-256: 66e3fc81662c5bc1f26618b4c576c1e693d5cf0b9d4dbab4ec6ff60eb8ef29d2
font_02_sfnt_off00012866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 11952 bytes
SHA-256: 743f5334b86769bd8fb8e242d83690df51672ea20a8c2189d237baa1d82849d1