Malicious PDF — malware analysis report

Static analysis result for SHA-256 1406feb42ced3fe4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 20:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51e867fdc860dad4b8ad650353116fbd SHA-1: 0b8e96c3cfded89d93885cadd8687455f54aa2ba SHA-256: 1406feb42ced3fe44e06f20e3254a3d06fef1ca1038e1eab44e95f364c401cf4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress uploads and disposable hosting domains, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=how+to+add+stopwatch+in+video+android PDF link annotation
    • https://daks-96.com/f/uploads/files/35376917401.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wixivuk.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/28395446189.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/wejegu.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wefomabevivet.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/bikurivajawu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324cf277b95---revena.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140856364953---wixawoxizevatifon.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/345e48fe1784c5a9c907b33c21eaa7e8/49856717413.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/95860168300.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/25304159619.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/248107705f6990e45400106c2ca8b567/pukujajapi.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/zijeseregexasetok.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/45885887030.pdfIn PDF document text
    • http://logicamail.it/draft/media/dipomowedibugekopomeriba.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210919124345.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2732946313.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuxutejebelopimugixepuji.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/nunami.pdfIn PDF document text
    • https://dhesient.com/media/74730678575.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rojopazekisabebapumej.pdfIn PDF document text
    • https://equalland.com/uploads/File/sujokixunefinufirab.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hksnbg77di0ad49jt57nnuug8s/54419063344.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_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 17556 bytes
SHA-256: 869c753553160e794acaae89892d7f8ff40b2680cfb49df996f364948f8a8196
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 10708 bytes
SHA-256: 06d607514fb565327b8a525b728cb42eaca692ed8728a215603845b57e72cf43
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1