Malicious PDF — malware analysis report

Static analysis result for SHA-256 e993f7d376cfc586…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 10:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ae039707af36fdd41c71f9c91e6caec SHA-1: 5829fabb0037b9f4619e386d37586c25ad56b443 SHA-256: e993f7d376cfc586bc4d8824131ee2478bd6fe2bc77b24970e0ae611c75e1537
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be disposable or compromised, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://studiogeologicotrilobite.com/userfiles/files/fonaxigeril.pdf In PDF document text
    • https://dichvuketoansg.com/luutru/files/98096816678.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/14475848274.pdfIn PDF document text
    • https://kokomanis.com/contents/files/34427931845.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/71376304889.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c326081e7---23873435017.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb507d3a37f9cd8c93d52b9e2760fb5/62891425541.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/zawisikimonobix.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/20122057467.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/virep.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/80578497346.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/pidavasotegafobi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lijanelofiwokusupivurubi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/kilabirujedafodakovu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/39124319988.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/88026126120.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/1541464778.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ddf7c59062e55e4416478f2c0532cb3/kobonugojul.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/77718174260.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/53674166693.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/koleleladopaxomazofoga.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/lokalefivuvawivebaw.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mr7gt0a1is4r7f4cn6ug8lk8d1/zowumomotixuxakepajaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=house+party+tonight%27s+the+night+streamingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 10892 bytes
SHA-256: ad6fe7290224926d34b3e207cc14a49483bb510e59c5749ade21fdad4880130c
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 18024 bytes
SHA-256: dbc9766e7bf8b01bc88fecf2035110ac815a62b79599fff0ac7e8eb6ab23cc71
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1