Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e16ae9bd14490…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6ddf8d81bac567892f2325400163613 SHA-1: 1d5f0ea8e67b40e542516b9d530bd86fff1ef300 SHA-256: ff7e16ae9bd144901d6adebddac81479276f616a412802cb2168f9b94d45b238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised platforms, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ladyqueen.it/userfiles/files/51689952259.pdf In PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/sobik.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/43167011087.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/mizavebowatodugomijaxiga.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/daxozokumisa.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/69254675927.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/51750026364.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210916155858672058.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/zupamegolugumowuwifo.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/45172052450.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/tukowuwumufonabem.pdfIn PDF document text
    • http://starma.pl/files/file/59030606764.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437590beaaf---83483175055.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/pepiwipinufatubivemukobe.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/14135480320.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc4ef5721c---56478915784.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/74757612882.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/70212097080.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ac238c731e8ed1873d2995b5c5ef4194/tivobowijadosefidova.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/kawaguzes.pdfIn PDF document text
    • https://begili.com/uploads/image/files/27937981048.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/60853387699.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/90177068355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=countries+of+the+world+apkPDF 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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 17780 bytes
SHA-256: eeb2cdef953680de2d062a93fa63946d8c216bdb8f6b31f9f0cfe746a157ca8f
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10904 bytes
SHA-256: f54426dc0e1f893c8f774a2c29be9b687ae2f0ad822218aa30305d06b67896fc