Malicious PDF — malware analysis report

Static analysis result for SHA-256 e058f817a1f5ead2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 16:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed6e6fadf2c97c621d866651fb71d7c0 SHA-1: 51b840cfe7e849a630751bb6da7c5cbe9be82b5b SHA-256: e058f817a1f5ead268058ef7725b070401aeaca578d17757e22066058559c8fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://indirimlipin.com/calisma2/files/uploads/37813758271.pdf In PDF document text
    • https://taxfirma.com/userfiles/file/mifowemekas.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/batoxigizus.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/45663810586.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/gikuda.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/69109342621.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/t54jpd8ut73i2tug64fnone8i4/zulasur.pdfIn PDF document text
    • http://pasaru.com/upload/files/tajamixiter.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/jigebalaluwezorupuxunabat.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bozolobesijuba.pdfIn PDF document text
    • https://termoformat.md/img/files/kigibon.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fkb2trb82un172dp96g8ncgls2/tuderofekeji.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/ketejaxitowufo.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/gedejuxodowimetivisef.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xedusufitutakiraxazoreb.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/11886289513.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16132aff352cfe---posem.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pogamokema.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab443a5a0---zemesazorelirivolosa.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/61805426590.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/melizazesexuputop.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/60395486785.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903023320.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/90815713680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cara+menukar+emoji+android+ke+iosPDF 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_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 16796 bytes
SHA-256: 232e50647fee083a182a8734b2ef0c4a330e9633cbc309ceab84834e0dec3e97
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10616 bytes
SHA-256: e990d948a5729542697f3185ff723908fac29a6dada4f4c5c61aa93b184560c2
font_02_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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