Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf3f0dd2dae7584…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 04:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e551740132fb7541859ba4fc1df6c569 SHA-1: 87a4a5710ca809df58f3f29b11b1fb1ce8870206 SHA-256: baf3f0dd2dae7584ef5a75e84e11c8d09f573ddeedbb32cda68f7545784fb4e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=clash+royale+mod+apk+light+server PDF link annotation
    • https://ecohort.biz/userfiles/files/24120595948.pdfIn PDF document text
    • https://beautydent.hu/editor_up/68593449440.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/74901502417.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/43232243500.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/69321790210.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1a24eab6653a07549e7b947bd5c2d73f/62307648736.pdfIn PDF document text
    • http://maulich.vn/attachment/files/15914673644.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/pevod.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/83e65fad94ba421bb1eef93654b672f8/kezupapaxetuwowufa.pdfIn PDF document text
    • http://bulmarconsult.com/files/fafosesokeladulobe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ukup9o4t1gpb8qg2hc1aachi11/62035590816.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/65017785661.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/94212730420.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16142ffa2c5357---jazokuwenidisawelelikak.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/furukorutupizegefedafume.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/58012907766.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091703061064.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/62771750978.pdfIn PDF document text
    • https://morabia.fi/images/file/22881306427.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/masotozoxuvo.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/kamimuzokozefusopoz.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/83872537573.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/24228910838.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/xupap.pdfIn PDF document text
    • 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_off0000b93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 17084 bytes
SHA-256: b04f285ab7adff62bacaa604bd954035c0cf02e55114d20d77cc47b67e5aeb30
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 11036 bytes
SHA-256: e46c3a104970321ca3f97fb03202b52e2ba5b19dd1ebfb61e01fd36f0b80a22a
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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