Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd35cefdc76bc098…

MALICIOUS

PDF

92.6 KB Created: 2021-09-07 11:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f8f1485f6e7cbbf0b79d54b13eb5d05 SHA-1: ca06dff1dcc537359e568e77d3ca1f89a83aab27 SHA-256: cd35cefdc76bc0986a3f3a0fa18a2f1e3751af9b99e7d5826605eb969c6efc67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded links to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3a08143f---pevutirapabiripefabazote.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d607291c6b---fonopikulofu.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/rinulisanil.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094749e5ab35---39669759012.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zuxozopowiv.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b91062b9d2778361e06b8f11b9c62b94/12537023544.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9aeb5ccf5---tojusuribovuwekurel.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df8fab75dcab8bc5e03dea58dd7aa14d/mifufana.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/74830077690.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/tifosit.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/4320913820.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/68984005118.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/lugurifonesumelowaso.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c28e2f9235adca5152e410957326a65/60535767865.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901150613.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/pupewifuwewigo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/posalifosikanid.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/rimebimumopole.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/wafujujimanofa.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/ralugu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df339b6d339---mejavefewezimejeb.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/jiwesag.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a35684ae---tokuveroxukekozatixozuva.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6306b4ac---78952087510.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/41540537381.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/soravuromulukebanupa.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40ba1e97f---67770800640.pdfIn PDF document text
    • http://princeverma.in/uploads/files/39456177164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=smoke+control+system+design+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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 11080 bytes
SHA-256: 63e3405db278aa9912b6b1f7b6f5454b4ae362a3eea6dd1032d86896c2bd58c8
font_01_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 19276 bytes
SHA-256: 4551b67fcb836c6959644bed654c9d6d8ec7fbda39455e9065ee4e0c623a9c42
font_02_sfnt_off00014c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.