Malicious PDF — malware analysis report

Static analysis result for SHA-256 9142dc6e726fbb2a…

MALICIOUS

PDF

96.6 KB Created: 2021-08-22 02:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f81e3ede354f7074935432827aa723ac SHA-1: 4c97df5bc1a505de8b39f3a98264c4200e41fcc7 SHA-256: 9142dc6e726fbb2ab5a3ce9ac0446efdfc454477872138c6217b73c154ae2c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bd372def6---fomipiluzifixin.pdf In PDF document text
    • http://funperm.ru/content/file/puxinizofu.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/xeworos.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/kagetepadawovotosel.pdfIn PDF document text
    • https://basisnomor.com/contents//files/23555201617.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/zepemiw.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/kulujikagefipudukakiw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ak3uak6modchl1o26qggb584qi/dokidovekasibudazugikusib.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7a47f4e3---lilomajigabo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6db8880a7832eceff5be719c4a0266cc/dejodinetemonudo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/wikiro.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/39796198120.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0b7f2dea8---20989367300.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/985454059e126934a0bd4fa2a3141d69/10043777329.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e9a80ac8---bivodusu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88efcd7131---lamanugise.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991dc4db795---57969533013.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d13c378b41---36583080169.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xonapoj.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/996ab986d74de79df508ca0484d3b3f0/detonebegunapaje.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620c3cddd2---gudesazekimubafedopof.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610087212ee0d---nedifodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=summit+1+third+edition+pdf+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF+%D8%B1%D8%A7%DB%8C%DA%AF%D8%A7%D9%86PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012cb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CB6 23216 bytes
SHA-256: 14c9b2ba4f2c9fd4942ab7123eaf02c104abed3aea9367e03078d8492be86301
font_00_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 10616 bytes
SHA-256: 9e24e1088572125d1e2118e89737a269d334738da48af3932d7c004f02c8ce74
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 16836 bytes
SHA-256: 98aa545e811560a52fd5eca48ec6d466d71f71db396b6e25109922c570ccfa56
font_03_sfnt_off0001564d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564D 17700 bytes
SHA-256: 4c1cbb549e4cc09125db17c81d544bc23dc591fc50ce1729a670198cb9fe91e8

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