Malicious PDF — malware analysis report

Static analysis result for SHA-256 9318f0bdeb507091…

MALICIOUS

PDF

92.0 KB Created: 2021-09-09 08:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c78826193dd4cc2e54867645060266f SHA-1: e6409f78844c46f5beaf0b5291e31698048273cd SHA-256: 9318f0bdeb5070914c9b04121ec29bbcfdcbdd4ba31b7918bd14459a8da80353
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote-support tool, a common pretext for malware deployment. Numerous URLs were extracted, many pointing to compromised CMS uploads or link farms, suggesting an attempt to obscure the final payload destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://orthocarecentroortopedico.it/userfiles/files/desurexewupirivemelef.pdf In PDF document text
    • http://vet-spb.com/userfiles/file/20759683975.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6fc31d8188c14e07e3350248946d50b7/fuxuwasekobefuxoz.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/bepixe.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09fb63350---60449631267.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/bosijix.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/32276203382.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/jozojataregabolabolupoxu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d73af2e4---99818458725.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/kafimifululebarunuxerag.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hpkcahh86tmcr6fqdasqstpn7i/luruzemekifunor.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/94828341862.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/84526779244.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/rajesuzasupofijufanuwu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fuxemokezazevenagurizulod.pdfIn PDF document text
    • http://e-district.org/userfiles/file/60175968836.pdfIn PDF document text
    • https://majubesar.info/contents/files/zesabugiwebafoxenogezu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946eda7e48---vezowez.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/60ed117f1e97857b91e1782c90d4c6e6/66857499168.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fuvigenafogojerixes.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2b672faa9d3631946fd3170f2ca1cccf/kozimirofoweb.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/47357358551.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/rikovibokuxuwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=malayalam+movie+download+site+listPDF 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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10568 bytes
SHA-256: d254b47a4a7020e3f31767c857f60b4991f3cf0df1bd68b51a8278f00e26bf0c
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 18196 bytes
SHA-256: 4b97cd039099e37751ee58dcaeb0f2febe1fd70f59630e608a018d63fee7c792
font_03_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 17924 bytes
SHA-256: 88b5ccf202ce9aa975761f6bd51317b4529f4bec0164af7a0faf2775857f7739

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