Malicious PDF — malware analysis report

Static analysis result for SHA-256 630e36914ca9edf1…

MALICIOUS

PDF

71.5 KB Created: 2021-07-21 15:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1d9eac57b87beaf151fa762277effe4 SHA-1: 341c520196d31903dcca5b178925ac232dcb69c0 SHA-256: 630e36914ca9edf16a84cbb533d35e05b06d74af6eaf90c8d7c32b819f32df13
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, with multiple distinct hosts and embedded URLs. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc1a9626---71676983152.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/janesilev.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vavekekozuxev.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9453805166.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/rijaditafagalitufomugexat.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/6712754994.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2148d05a40---zamavoxejuwutup.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a304d758---kijigukuxixokimatabegi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74fea2eb2---daniwiripexagipusev.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/5761468531.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/39547360152.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/49967338646.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2712648e7---segivibajafatoniwotinit.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/kabozabupapugeru.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0d85cc8b---xebibabajezugunezaludi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vijamexomenusud.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac2f8a7f7---46576131919.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/99922256259.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/64060996853.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/berorujadik.pdfIn PDF document text
    • http://adveotec.com/img/file/giludekudijemugusuxe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1199d958---tebusexupiduwoguniwu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac361d0aad5---jokubiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=triangle+congruence+in+real+lifePDF 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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 14512 bytes
SHA-256: b57430b4eb17e8ee78880153eeec7d7e584cc7f9c157c78b18678eada0d42a9e
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 10308 bytes
SHA-256: d2b70f9b8263cf0774741fe657b320c55847f1469884b7cc2f5927663b4c6203

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