Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf3eb13016adcaf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 17:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 082b6d4331f7a72c08f4cd8005d99839 SHA-1: a731bb80ea89569df738ac0ef644303f59416c1b SHA-256: ddf3eb13016adcaf634668af77f0428989110d5aabbb4821ad074e3195884ec0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users through a chain of links, some hosted on compromised CMS uploads, to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://saikunghouse.hk/userfiles/mokekavaxasaxo.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3f4f1462---21721989061.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/295056730.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/tawuk.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/37776107575.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/keferadibimajanafidug.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/14419587314.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7e0452a2---53441721451.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/22276934920.pdfIn PDF document text
    • https://lasanisports.com/files/87992503151.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/23265617211.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u6qaen5rhcugnnlqj4kb11o75p/supagesubasokifid.pdfIn PDF document text
    • http://sam-global.info/files/file/novowoduvusirabagugilapeg.pdfIn PDF document text
    • http://melvin.cz/data/37132060323.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086546eb10d1---funig.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tafodonirojisidanupabosu.pdfIn PDF document text
    • http://poorclarescork.ie/images/gikobafemifu.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/fejawodurexunulovafi.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/satuxebubumure.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/182024194142.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/xelorewerizufudukapesam.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/xetezurifisekawamon.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/migonenizob.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7b5ec75f04bc99836d5e4a69aaae2c2e/96346555292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=basic+photography+manual+pdfPDF 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 11204 bytes
SHA-256: 69602d1c5a7bc05d18093686edce3fdac14521d8e2ea89d1686602d37428eb66
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 17580 bytes
SHA-256: c7d4bbb5175a888dc545e7c28d1526d44b9def03ef605f2b26f45aa1d11f9beb