Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf96cf54ad71efb…

MALICIOUS

PDF

128.9 KB Created: 2021-07-08 04:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2859028131637bead9059f5c7e852d4c SHA-1: 7bc5a2e6a96f6abb90c42c37d5c290526d047dbd SHA-256: acf96cf54ad71efb1d999bb8222060f2a09294c1da0aac0b531bb356c52421a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted from this sample, but the presence of embedded URLs and the link farm structure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://nomylo.ru/uplcv?utm_term=how+do+blind+people+read+braille PDF link annotation
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb250736c4---53673715851.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/71271376196.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098142dda26b---40369097260.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/27bttj66naat92i0of6s2a3l91/pirurepereba.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cd38ec384de---52120606582.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30a577f70---pureruzemelewe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23df669ecd---sipudozolewaromoxokoku.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160792b66ec448---7653661127.pdfIn PDF document text
    • https://areicon.com/images/file/32915385612.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/momotupobajonade.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2cb50dde9924875fc89b747f598953b5/97840118127.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/10529090666.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40b20f632---xasonugurobesexiba.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3itj1oeqfdnnfstqlkuoopk03s/fedelilanomuj.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/boranodo.pdfIn PDF document text
    • https://emprenderem.cl/files/20163791780.pdfIn PDF document text
    • http://attlas.center/userfiles/file/zisakemosokisosatuj.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/ziraraw.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/boi32po1oqgeg5jifh8oikb6c3/lavikawuj.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082601e66519---78211129696.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/76514582211.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6999f7dc---51626419320.pdfIn PDF document text
    • https://o-dance.com/upload/files/zamomogogig.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf473296293---43876209270.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001c834.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C834 16348 bytes
SHA-256: eb0ec9dcd0e370dcad4633a1d6b5ab86c59d925745eefed4b4844cbd3bb6d26b
font_00_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 74320 bytes
SHA-256: d2918097af1146bdc6ee3a55d0195f55f76e3b1fca1c660520f5e29eeefa0d34
font_01_sfnt_off0001b023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE97 10336 bytes
SHA-256: 2267d35e2ff9659fdf7d2c536b80cef6697edfde428a5b6e039f72600d306055

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