Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d3512b45fa0078…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 10:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98c64214cefa17b17d5e9eae87f7934b SHA-1: d5ea7399ce778a1929654fb673ab2af4b54e5b86 SHA-256: 63d3512b45fa0078eef12ed376e74b076dfa1dd10fbb51a52d5e5b100febff9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous PDF files on compromised or disposable domains, which is a common tactic for SEO manipulation or distributing further malicious content. While no scripts were directly extracted, the nature of link farms and compromised CMS uploads suggests potential for delivering malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://elpollopaulino.com/cenavarra_userfiles/files/zunanekapejiwu.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/idoitr2ces28r7o49e3rso1eju/53205286640.pdfIn PDF document text
    • http://sro52.ru/uploads/files/80899829353.pdfIn PDF document text
    • http://nfc.soo.jp/file/26622673262.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c7adb98a7---81943638255.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pt01mdutvqmurocvcooeu7k0uk/64838632206.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nafajezezoretufo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/43fd103abb3da0901fc6141bc36acc53/kezobemujexipituwezakurox.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/labewogavawowuz.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a50084f628e3b74a06cd16e81f354121/11466618871.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mflh0p84i9h2q75ku0s5u0g381/16337957460.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kunezebewesagexugup.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/19626344738.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/65264433189.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075344555333.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b597dda2f---dizudafeba.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/zimagegigetolifoxubijetes.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b81899cc---janowunoxixenet.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nrtrnqigitlulb4qj9gmaohbft/77755016737.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/908deb19c95fd3ac2ff89f876c0b116a/zasisekewusa.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/33814860584.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/duwozevijefowularadizike.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a805e8957f4---12529418742.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/16593611827.pdfIn PDF document text
    • http://xtra360.net/campannas/file/15511563859.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd796b0f6d---3830622756.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25c6eb86fa01de12e44ee327ac7598bc/vuwemif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=factorisation+of+algebraic+expressions+worksheet+class+8PDF 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 11364 bytes
SHA-256: 23c09432ab114618ea0d3f9a380f7648609a66067673e94281996ceb360541e5
font_02_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 19072 bytes
SHA-256: cb8335ff5e360d4b7eae0ee49bc8eb3fb8ea41a10ccfc0e7429bdfad86407ed2

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