Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60ca82a1e1f90f6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-21 00:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3440f0d511bfe4c73b69a5889b8b9d82 SHA-1: 1d746340344e78d77d60962347e74789c361c084 SHA-256: b60ca82a1e1f90f62de474ce413d75c8f6d9fba34731f87da581dd2bda284792
196 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 uploads or disposable domains, 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 techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=android+app+webcam PDF link annotation
    • http://cyuanmei.com/userfiles/file/7953872592.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/61984356856.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/gofapipodiduveb.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dojumokelapiseji.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce3d51d6a---wetonavamud.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/58890368260.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-14-13-03-33-BhrIrIeq.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/19545650614.pdfIn PDF document text
    • https://yasacompany.com/upload/files/relifiv.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/zilewu.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_011947.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/16918432932.pdfIn PDF document text
    • https://pixel.bg/img/file/puvapixikemawofuwekifane.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0477f2542cf7e1276efbbfa0c0906f9c/poloxagi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614627dbb07dd---97683432275.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/13432022361.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/sazuribixedepabumuzelo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613789e5f08a5---keroxikimonorede.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/simibebepulabadimowuxa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4crbusvlk19u3m7rjeq4hq8r93/6809732981.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/wuzugevu.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/vobakevegomonefulawas.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qk0lmv4ppsmkvmrbmnmvli8bp3/55276601875.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_off0000b63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63B 10568 bytes
SHA-256: 3fc4be3a05d7a9ee4b07e6aa74e355dba2960e12e8586001d53da39ab522845c
font_01_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 16212 bytes
SHA-256: 6bc7f6785da76ae5a181b7d5f84834f9cf87ca6be80ba713c0b43c4ee3dbd0e6
font_02_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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