Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aafb4627e9c3c62…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 13:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0558d719c8d315dacd560b8e914f1524 SHA-1: 8c8867742f5ff1380c409551c8a3fa02b95d9181 SHA-256: 9aafb4627e9c3c62f3db1f85c77159aef1e8e2ddb78b871a32f9d5172778b3ad
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm designed to direct users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://ceccarmehedinti.ro/userfiles/file/buzofosewixikilidilo.pdf In PDF document text
    • https://ip-pharma.net/data/files/dexogulozedezurojixiza.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/2548972833.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/vixupep.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/kivamaxelisovut.pdfIn PDF document text
    • https://t2sc.me/userfiles/42154781586.pdfIn PDF document text
    • https://htchninc.com/d/files/viwazuwe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1e5b0c2b---rinoz.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dikajopujokakobemuvelu.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/kotesanunegolu.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/77732523996.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n13rg58ehvj0doalkt7jogthk5/44038078028.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/12432702010.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/5674516954.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/64458514030.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/52625309815.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/91624606610.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/dijenusukujekesejimiwa.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/98209304694.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_4FE70CB9FF83B527.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xuviriw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54fb5f73c---sefefejof.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/zezituvofinom.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/rofomawebujirimevur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bruner+scaffolding+theoryPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 11020 bytes
SHA-256: 76b21544b4f156b015d57c8676f79d10634a6e1c431c98b2dc4e6977f8d1f50e
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 15996 bytes
SHA-256: e57a8411a0eb925a04233ef70e9d73d6d4a6ecda20bf7297e021df5d64dd431c
font_02_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1