Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ed0ff9741525f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 18:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a4d00d68bf4dfb91632cc505ebbc089 SHA-1: c89cf840e011de9dfcc8aad318c53257da56ea4a SHA-256: 77ed0ff9741525f97fbd803b3bffde6f8d652bef52190c2a9bc06f0adccdde84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are characteristic of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://botosani.ro/img/uploads/file/tuxerevitoperusetuposugi.pdf In PDF document text
    • http://castanienfamily.com/clients/74558/File/54026859432.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/zedupatodu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/fojufirojifovitobabeb.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076272482808---lijowe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/25bcd73ed0b4a949b801fb739b3f1bb9/tutiwobaraxekuwonujiw.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/lubalikuwiviwem.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fd00a8e25bc---18250395645.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098be912eea5---mikubirumixefaviwotux.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zubamivefugujukinaja.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/73731174780.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a143d1abe10---loxajomisolaxodasusuwud.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/zisivufepobabujipez.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ab48e9d95807622b8250657c6d4ded56/madamarepejopiwef.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/u0sa3o0vvjm03nq50g0o11blm1/wipegedi.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/bejajadoloniwofil.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/239985bfb1e0985fc942fb501c84c853/mafaxaparalasagawisuvela.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jg1bblo7ng5k7f1uh70tpackte/latek.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/zedadixuverazonegopolon.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/larowagabutiro.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/74930870748.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/92273586233.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/81d3eb6e0cefaa15f4a668e57c7e3569/8301914353.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c9430712877edd0ba0192fba9d591c6a/wotajovudutokorabedol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=aquaculture+pdf+in+teluguPDF 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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 18192 bytes
SHA-256: 684497b5ba42f6678bbd134d661d64a4ecb9d432a820a91f9c88626aea1c2e13
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 10732 bytes
SHA-256: ad6f141c9231232176b160a2cc818074aaa4ac98f1f264712d94b400c1683a91