Malicious PDF — malware analysis report

Static analysis result for SHA-256 9816897fa00a8b71…

MALICIOUS

PDF

82.0 KB Created: 2021-08-19 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d2cdd05eb3e073cd7bbcc0ad08df568 SHA-1: 6bf8b39a9cdbeb59662b06d1e37738b734ba88ff SHA-256: 9816897fa00a8b71ed9fcbdcd427b82736c0093bb0c6e734fe946dcab1895ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9394

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 http://alhouti.com/userfiles/file/58133472734.pdf In PDF document text
    • http://industrialsupplies.pk/userfiles/files/sovelobepegak.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d07e9974909---3272218713.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f17cd125---julibov.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8088d42d6a6ac4267f9bc7affcf15d9b/bikugox.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/rodotidapokizov.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sp115mur9jrbd1c8ri0plo7rdt/rofijopebisubaxasobefelu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/9586697973.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210709142205436.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bf83c9812177a082f710c54aa6b78f26/59369310889.pdfIn PDF document text
    • http://ceroki.com/image/files/vufalowajukokeguwuvoka.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/59837517496.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/megenitakamajiwosifirutu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa799f4d8---panurobelovifebanojuvexo.pdfIn PDF document text
    • https://defaico.com/d/files/40250617132.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a20819be---83755373138.pdfIn PDF document text
    • http://podarox.ru/public/files/kawaru.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/21894832427.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/64838451809.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/94180174973.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/700f664d8f70d8c5ccf970c755034151/tuxisiz.pdfIn PDF document text
    • https://peterdegendt.be/file/77797317747.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/p4l0gpqti5heorntjnbgvft8a1/25231597442.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/84042286092.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/rojejinosazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+a+letter+to+bank+manager+for+cancellation+of+credit+cardPDF link annotation
    • 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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10960 bytes
SHA-256: bb0c97db8e41506d04ee11c39e405c98bd15e135cdc68c8dad91f7c2d033655e
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16772 bytes
SHA-256: 93b9aeb951f281632508be71e0c7b8974f05180b412eec7e163341ba2c81c7da

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