Malicious PDF — malware analysis report

Static analysis result for SHA-256 297321ff7e8cb25d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 14:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26a78d9e83c11dfe3ef67c014326be47 SHA-1: 3c94feba559e8914693c6cf297563cd2ee136054 SHA-256: 297321ff7e8cb25df0f2d5ebbc63e967005ce413f9b49c579baace1e81187cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=castle+crush+apk+mod PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8f47021b---jolodolizeverikuxulo.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/xadigewerozamotisogebisos.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210902075553922.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nejigawomogisek.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/87965758734.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/zagotivapipediwezaziko.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109062147077207.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b5ba7a4d---59661247281.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/83747989715.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/xuzabajilesesod.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16308898651306651600.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/detozi.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/voxusevojufewefumakosos.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/jininox.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/71704188718.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/25869923377.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b8858f6eae308089c64c5d3684eb3f6/metajasi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369542cfe5b---podiduxibajazinujokabik.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bhf4647lrmimlla9jpuo9i61m3/49536120119.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kajorigaxikazaniluwa.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/89570026889.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0c3303efcbcc54067a37ad513a91b036/wesixogunedapixezagut.pdfIn PDF document text
    • 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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 17128 bytes
SHA-256: 89bc1dfd8474bb0cdb3826e888997ed275ccbe0af9b77daf80b8ba312a284776
font_02_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 10804 bytes
SHA-256: 5bac802d25b4db8c5e3cc7c2630349b52c133d82dd3f0a66466d5feb654a7561