Malicious PDF — malware analysis report

Static analysis result for SHA-256 812fed195693543f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 20:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab0c487ec6395fb369341055041540a1 SHA-1: d9b3a44c4534838926aabe8f375c3ed4c2df6f80 SHA-256: 812fed195693543f8fb28b3506261591ba4879e413e0c94952c5a6344f9efd32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://caribemed.com/userfiles/file/zegefuwog.pdf In PDF document text
    • https://csp-pub.com/stockages/files/14945422978.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/pujegebogenoxuvogavote.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/biwefopewagipi.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/13634587811.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb87524ac42---talotejononefeveje.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/dnkf1bqtidj150eqra34kcjqnp/84455708668.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zazejun.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/batuvelibofuwo.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/mitosujokunulojojobos.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/nibivebobulidiwewonabelen.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078245d2f75a---vitudefu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b265ac8e15800e5bae9dab32168eca59/gemijisisinutoramis.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/59820556802.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/sodozabutiro.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/68094742913.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/99172111791.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/rudosorizer.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4476cdadf---depefafarewuvulig.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/mirumef.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hjqrg96sfcnshein7mlhuko7u5/93274811087.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f0ca0f74aa5---gomosixanifuwin.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/genabidokofotowumugilo.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/xojutuluxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+reader+for+ipad+1PDF 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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10128 bytes
SHA-256: 3f3dd2c321b586415864d26b2dec34416e44b5266d424f25bb7aad7b63aadbb8
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 17904 bytes
SHA-256: 69f622ed7250355d77ece86a64086212062a795f1e9d5238ed449b9dcbc2c244