Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdda5eba6cb510d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 03:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de2c1c91bc7081aa2f9a0077db88936f SHA-1: a76df945e49edf43e088c868adf888ac4222b243 SHA-256: 5bdda5eba6cb510db68fd2ffca52666f8cb432f3c08315372a616cf20583bd7f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are hosted on compromised CMS upload directories or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests a phishing lure attempting to disguise the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://tarzminder.com/resimler/files/relataxubujasud.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e2ac274c8796a579f71f19a119f29cc2/68091391032.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f1318e41c220ba7bbe89820ecb17baf0/14809514935.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/37399677217.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/53261454678.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161394096b46b0---degexalezawabififuxife.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/zutelolixixuxoj.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/fedekisojanazaxe.pdfIn PDF document text
    • http://zuche0551.com/upload/file/suzafagujorexololade.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/6531939084.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/55539804085.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/36659504768.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35532210348.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zenapawutoxemagafafamamud.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/61762785871.pdfIn PDF document text
    • http://medrea.ru/upload/files/45325229817.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/tunofaroxozize.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/62876678080.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/92958353078.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/nemusesu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/rexorateledodulonu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/24751247909.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/52577847689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ishq+vishk+full+movie+hd+720p+download+blurayPDF 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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 19728 bytes
SHA-256: cce0d555835928b43d07e1821889151cdf4c64ba442da5faa59a38ca1ee4924a
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 11652 bytes
SHA-256: 35146f9ebde27f6007a2959ac25465f8dc7f8ddd0db3eba047b2fcebc087915a