Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a1979e700e003d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 18:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a39581ebd9878a955f535642cd6398e SHA-1: 97d25b4a292311f88392540d1ff7f5c820cb8f88 SHA-256: a2a1979e700e003d51ef98fe1a89a20f18ec07bdc0165cb730c3780e8f2c9953
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, likely to obscure the ultimate destination or evade detection. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6f4511233174409105cb4b93098488b1/dusalimerikenunotuluw.pdf In PDF document text
    • https://weddingitaly.jp/images/file/fukurepexo.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/7322867712.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/27526634547.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e03b1544f---sanagudofefa.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jezefelodejelojinolu.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210722035707.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/lobipanakid.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16cfedb65---xovemufazugosive.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/roxufesoru.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/26108819101.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f2a4a375f---3795462680.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f26324d2c---raborepareduwinemides.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_224116_149.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/37983889124.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/80738804341.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/26335273157.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jifuzedimade.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c4e62038---saximowavejajo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04e878e29---zinuwugelumitobonewusepiw.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2390435411cfcb16f4cb995467ac7025/74451011902.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbb6dbf4c---31945931810.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c00a82101---ribojudijagomekubusow.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/35422229547.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/udol4ihqojg3kd262abutma0fp/majob.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/39621975053.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/85073788081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=finite+state+machine+datapath+design+optimization+and+implementation+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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 11004 bytes
SHA-256: e59108f81c5429d7c6eb1d0837ad30c61c6d281570be26e2502deb1a8a36aa4c
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 18712 bytes
SHA-256: a7d5fa51263178345ba421d71233de320f46fb434afc0704951588886725615b
font_02_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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