Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b00b45addbec2e…

MALICIOUS

PDF

99.0 KB Created: 2021-08-04 07:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8aeea2638a1ed1e509e8ca36ab7f9679 SHA-1: d88cf989b926b6dcf0f081e407a33e4dcd860289 SHA-256: 99b00b45addbec2ebf2f76220657af4a188738e366e44bef626ae5b68a06cadf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://primaneighbors.com/userimages/13295435374.pdf In PDF document text
    • http://indagosrl.it/userfiles/files/72925937956.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091091a6c3c7---modijinisemagosukuwig.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5101f774e54dc32b05546c1c711a2f41/vedodunugizefesubozugopa.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/bewataji.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/6jrjr3d1f4ksr24edor8hca0ck/xesekozov.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/14881512685.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3910336c6b---59006099180.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zomosejimotuwirurexu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/51656056277.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/53001624219.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/77638194281.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gelesafijuxonoga.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/mexasotubesele.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a6adce7f62948bb4ae7179b16878ef5f/88215242344.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070313541139.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210803081927.pdfIn PDF document text
    • https://robertbah.si/files/file/5313062449.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0dc824df---94050131566.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/nutakefisogelewune.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/91245803206.pdfIn PDF document text
    • https://mszukam.pl/dat//file/pivimig.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9bddb88ab44d5bd33b36ae617bf40c76/55387396390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=math%C3%A9matiques+cm2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 11028 bytes
SHA-256: 53f41ca2734473971d918ff1e5ec88c4d1317bd59c6823dd784b345d280ee288
font_03_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 19432 bytes
SHA-256: 502587ceb9df3f98ac211b76381523ed9c27404d59695b437f36072b6306ea90

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