Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef29c1f5736481f2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 08:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 880be76b4d62730d5c5c246409753a54 SHA-1: 95ddaf55170c4598b0b7a39483cf585e7c600da2 SHA-256: ef29c1f5736481f20a6eff6a6fbead260f3f5327ef21d18ae5b41bde537f1379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=focusing+on+ielts+general+training+practice+tests+reader+pdf PDF link annotation
    • https://vibangthuaphatlai.net/uploads/files/watigilorera.pdfIn PDF document text
    • http://vce34.ru/attachments/file/xezovisetinukedifemivujuj.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217311239624.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4c694e89a8deef7880063a60a4346b4b/lotakenudolat.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ea996042---34320213148.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/pojagisabibifati.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/nubelikotobufuz.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f1ed23db---vorusojatu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1dad0553222f415aedcf62e544d319d/sipujirezixujogoxepexe.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210710_1B8C510A475BD7BF.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/873817781.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/63772021880.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/59919055679.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe0a3275---pexevagutabirilowak.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/nisomiloxobetubib.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/katubazejuxadop.pdfIn PDF document text
    • https://mcsfood.com/images/file/rurotivutusomegevevigob.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fixugaxosodijiterev.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ub68c5ebfvbvu9umtd2o4iolfh/tipabatefobiwomu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f3ab235ebf984cb2e8a0ee45d3fc2f6e/60370046360.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/64a978aec4a987caecf949d264d08e93/98384706583.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072822e45421---kololunesimiro.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/22337215817.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 10872 bytes
SHA-256: b93ccbe21c9af524025d48f29ab6194f836841acd7744786f2a12cd28a64e83d
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 17276 bytes
SHA-256: c1a6d30179bd0c0014d73c7f130026270596a2e57aa691e9e03249e6b6964521
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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