Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5880a8bc134ad4…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 02:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 68a82d71a084bf2f6f244b164b9ec403 SHA-1: c67b82a15b3b15c7fb62a0147fe41ec9f5d9f9e0 SHA-256: ad5880a8bc134ad44c7ed592c8f9243d356c939e0ef1d29be85433f75ef26573
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. 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 0.9975

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://ketchas.ru/uplcv?utm_term=bilateral+renal+cortical+cysts+icd+10 PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/372cd99ce7da38f5e878a96edc644dbf/jafadabexafateredi.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/gupotewibeziwe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v1cg47nqpvfqdc1jbviqvd9e83/xigetetufibodidip.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/tobinubodalotuxorijip.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/kukonadosiluvinavidokewu.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/75413795554.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/9417270230.pdfIn PDF document text
    • http://htwy.com/upload/file/8576236224.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/vurilapofusewufuwuxani.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/61721028318.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16158deb0cb2a8---46518380326.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/dadodugosabuveva.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210927142035.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/nakuzoverukegatun.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/83076768641.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092311081234345.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/64118435523.pdfIn PDF document text
    • https://red-adlay.com/upload/files/gixajot.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/24164194333.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/79852479998.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/dorefojevufalapozituf.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/73847451285.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vatusidimafexazixeli.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/69352422121.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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 10704 bytes
SHA-256: 0b3edcefdda6120db5c70c990451c52dc48d2c3e0d7b62eb918f85aa05ba8177
font_01_sfnt_off0000ca7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 15908 bytes
SHA-256: 35ac28858fa0dd21baa105d43a3c5b9223c3fc59939d346764be1b76dab1a440