Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22b08e1f4006c6b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 01:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf9497016599a6091ddbca3b5221a575 SHA-1: a3ea07b45dec8ff873c8a24f5b1c99e06020336d SHA-256: b22b08e1f4006c6b120ca3a5c30b8de96cf15137d38ecbe6d402fce126dfbad7
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming, likely for SEO poisoning or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+make+a+live+wallpaper+with+multiple+pictures PDF link annotation
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/otk44f6n36jrphlom1sde8hvfd/fuwiviributinifova.pdfIn PDF document text
    • http://orthopediedelft.eu/files/34241882099.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146266616c02---rawiwemimotogibejimi.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/2929884990.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/43949916478.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/volepolewasufemoxajusof.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/wemaxetemesegevog.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/roluk.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/80565160525.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/7922669883.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/90799723707.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/33087657253.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/33808848318.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/68267955048.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/gekimo.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/lozelafuwapifaw.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wazizosofikoj.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/39064076507.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/nizofomi.pdfIn PDF document text
    • http://grimastone.ru/files/77177338092.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2o3hn526j31es3m3bp80gduupb/95712907555.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134db8be2f4b---nanuzimifuribewekovamo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_135158_181.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/rigesinivujudiz.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 17760 bytes
SHA-256: 28d9bfcf0b8750bd31f94a9ff4fd21980068d243bea02009276f45e7803dbdbb
font_01_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 10868 bytes
SHA-256: 869ab13f5f4541079c0ccc5304855b4bf67ec8fb75bf75a5788b1a42bafeaf9e
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.