Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c114f79bd26b36…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 07:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd515d04c3f1778ffcc366440e00ca95 SHA-1: 58ab0fa368ec0596859afa5a96957239d6b6d263 SHA-256: 41c114f79bd26b36a52a2c825c50c3f0f0074c6937609d907397ad0b2281d1bc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27b4bf259---88066172896.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b0033440---gojuzirivo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5f128d17a---jetatixoriferikok.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/70715247294.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/lawekutav.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/dabezijalum.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/foxotozubogakisupivelenef.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0def182f---sebezisudut.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/84875208612.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/27267547162.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jogeloje.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/kh1hot2pgof2i8feam3vqomhin/29896149069.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ubnfkffuhpko113i4odtr6hqu2/4955073540.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a7a6fc58bd96d1ac64b84b8c204fb5a1/rerifetabezamifozub.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xufekegajodanukodike.pdfIn PDF document text
    • https://nasikampung.info/contents//files/43345990944.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/28649468996.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cl6o1fu6rcnon9s82aor79ehva/japekamexogewokutabimiv.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbf18246a---jamakozelizo.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/96387111141.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ff74121---nitibilux.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/c2asee11k3r4j5b6v99iu8oocu/ritazunikigetad.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/53867787223.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/nokilaxobag.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/58754545130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=widerspruch+gegen+mahnbescheid+formular+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_off0000b64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 16880 bytes
SHA-256: 33b085aaf48e2f27fd17fa3b936c79b0f44cf6f0643b9df2b568e893ac31b512
font_02_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 11204 bytes
SHA-256: b1bcb5b25597cb8b3f8d3f765ccf277f3a2ed2e1c4bb04cd060cf669b96a781d