Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb707e7ed034d848…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 13:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f11ae7d2033c644c5d67028008a49a0 SHA-1: e371beb9ff3e9b5bc8e4370f9d9b240065988a5c SHA-256: bb707e7ed034d8487227abfd56d86140611c5b7f2d153b5f712927d9a524d53c
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload links suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf7530c898---wopexoromunarudebew.pdf In PDF document text
    • http://patp1ryb.ru/media/file/84463476204.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nesaxobabivezinuxuvim.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/piwizezuzebimesopudufed.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5n2vsc0o58l1ig613ssglq2h95/17217331767.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/24836551951.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/35261553322.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2c0d3634dcf6681b500d38faa038d716/bokulukina.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/36868184314.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/61d0f955be6fa5542331322565226623/37142781790.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0cb0ee8f22970b540c4fe2c179823365/30707986636.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3c21241e99b8b258e3fb83d1f75ad3f2/lodijepuvobafejovelejoda.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/98936885793.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48e003adca---48281250442.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/79305419079.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/75d4287f3245650f17ee10d88a786ccf/liloliwopebarebemax.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d6ea0e468fda2d49217993dc3279737/biluxuka.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/17176464974.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b42585401f300b8986b135ce941701ff/12435961583.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f82132f23c7418b98dca40c4b2c01401/fedadurezosokojake.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4fmpemjj2j1p4s2vjchi6goohj/82675875587.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473e036845---53696251632.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2392aee4a---ditifikuzofase.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcbef5af93---vozizaw.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210828_597268A315003793.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/40664880409.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/pexibamojikomekivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=principles+of+corporate+finance+11th+edition+solutions+manual+free+downloadPDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 11124 bytes
SHA-256: 9c6b9c84c7f3dedfd70d8730dfccba4c50a737c275169abde4f9e63abdf6ce20
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 17720 bytes
SHA-256: 8cb0afeb9543af2ff854f2b06bd6c9ff029b815873fab8ce2b983f6c72e371e4