Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d615a5e9b8d41f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 16:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 878d1dac2ec34b5322e8c398891223c1 SHA-1: 4fcfd83771aeccd12bd943b6bdcd1bb7f927a7ff SHA-256: 90d615a5e9b8d41f65272b2baa10fef40c06f1a528702961f977a9e36f1f3c8c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://orvositudasbazis.eu/images/upload/file/26261952483.pdf In PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/34354781061.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/gezod.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/65559530487.pdfIn PDF document text
    • http://bjjiffy.com/upload/gomidebodasuvaku.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393a5865e65---dakosarewejulamudabujaret.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136f88d368c5---19407181940.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/wizegikiwosemevuwakijo.pdfIn PDF document text
    • http://royalgroup.at/tmp/3879170115.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613584731bc63---jupumeveditorupu.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/25291153144.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/79832017015.pdfIn PDF document text
    • https://electroagro.es/pub/files/piligimatisokid.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39372d77f---13439155591.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/kolazune.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/budafumejiraxu.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/51001069958.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/jakunazodemizuzepe.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/jopixexowezibinamoroj.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/32633072868.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/57583726831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=layer+layer+pada+osiPDF 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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 10252 bytes
SHA-256: 8593bbe2cfa3a988cfd3a7231faf0882d4b64b64c9464fea92be3bc107423cd0
font_01_sfnt_off0000c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 17652 bytes
SHA-256: 6dce18647aceefe376ad423ac728b36f9c3d0183c8371e9a31e827ca8f316e54