Malicious PDF — malware analysis report

Static analysis result for SHA-256 91505824b0569ca1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 23:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d44eb3446382d746a816d0ee8aef1b2 SHA-1: 7c9d497b8255f7e62392be45924f1272630070db SHA-256: 91505824b0569ca11436425b0aadd3e992a0c7bc142ffeab236601f4bac51caf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://h1t-url12shio-turbo.com/contents/files/maruzaxogugox.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e246c1061ef05764abf4a248cca30934/24269210530.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/vowogafufum.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/njg44rh0n0ju85e4jd2asvv9k6/74868035458.pdfIn PDF document text
    • https://gornjastubica.hr/files/bidexogabop.pdfIn PDF document text
    • http://seto.cz/uploads/sumalofinawukegegasij.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6d1398ec---wujebizilafubafonag.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/14254338420.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vigesamoregirages.pdfIn PDF document text
    • http://htygroup.com/upload/files/677469636.pdfIn PDF document text
    • http://hjhchem.com/upload/files/82752297721.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/15901948331.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613da23639590---mutifapel.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f45c383e61---mepud.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nigesoguvesaziju.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/95116339596.pdfIn PDF document text
    • http://cl-pub.com/files/files/70523831299.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/depunugajive.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/4378896672.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xajefakogawo.pdfIn PDF document text
    • http://imoroz.by/upload/file/gazijazojixave.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/datajejurovewomeko.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/34241684640.pdfIn PDF document text
    • https://rajaunited.com/contents/files/sesuxupodizilufupelejesat.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/66523062952.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/29090870304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=telugu+bigg+boss+2+winnerPDF 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_off0000b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 10432 bytes
SHA-256: 371337b2b0bd5a738b886405789615054810214a8dc7a07815fcda8dc01bc642
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16884 bytes
SHA-256: 133c6ccf279cdc0b9df6efc919e18d7901bebd06b231f0dd22de24828b19c23e
font_02_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1