Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e2058194e7535c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 22:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb0ece3f5939541b324a41f7ab74170a SHA-1: b577de8d6b41e6a5039cfc14d6b83be908d73487 SHA-256: a1e2058194e7535cacfc5d7cab683e615233a4075c06ac2cf314403132635d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to a phishing or trojan delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=angry+birds+classic+game+download PDF link annotation
    • http://fmmvn.net/userfiles/files/80753286535.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zotevaterosijanixo.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/vofomika.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/pavuzubifum.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/manijanakibujofana.pdfIn PDF document text
    • https://ratosatu.com/contents/files/dagafitavonerukasiw.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/75752668213.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/41898726460.pdfIn PDF document text
    • http://okvin.org/userfiles/file/75620732116.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/46268373128.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/723007972.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/49878883182.pdfIn PDF document text
    • http://aweibel.com/Photo/file/30648235038.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5a92bcb44b95ce7b6650267afa24b3ad/90575785118.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/66645510295.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/toximi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/43567865079.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/zekebufovigivux.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/dopil.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5fef5c97c1112ef551bae92243677f28/26245552992.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/42889364832.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/66052712433.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132daae13ea5---birosajo.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/jubaxitomeduwuda.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/tetalexidozowemifoj.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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 18248 bytes
SHA-256: dced4da09258b9f709691238841b33e8bf65d78cb3fd69c6b0f69cbd102a4e71
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 10936 bytes
SHA-256: 426482dd8bd2a9413c4339b7734b5a6260c71f0a7003b427baaa0b5baedfaed2