Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a98ced50a60d20…

MALICIOUS

PDF

80.9 KB Created: 2021-10-10 06:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81bb36d0ae33c39fa218eecccfec994d SHA-1: 2d01ea902dd0e0ed30f64435f3859a6bc1b3e1ae SHA-256: d3a98ced50a60d2077a0a107f95ab1f5077c7d90ef0f2c898a248ed07be751a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=wien%27s+displacement+law+of+radiation PDF link annotation
    • https://indiansabroad.uk/userfiles/file/rumuresovulukuputidelorat.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161609f45610af---funujofugokidabozula.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/43165840075.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/40272187942.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/96346309297.pdfIn PDF document text
    • http://thegioioto.store/upload/files/gogovulefixubabul.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/jibapogal.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/aac1f6154b2513c34b94590e58a22e75/97734269990.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/magitutigalovavisikizaju.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5pbld5cb5v31htejlo2mb36lfd/lesulumafaxuwivujewa.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zevigori.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/oue55m4gnof9hnjc7f5kh8ms83/sedadazi.pdfIn PDF document text
    • http://altus.pl/userfiles/file/fumonawurobazapubofola.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/62566677619.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1e77f0273915d06b46ce8f2a5464ee71/lunod.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/45961992128.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61515348612.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/86831036974.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/29351055519.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kurojebenalovukunugat.pdfIn PDF document text
    • https://chemainus.gocascadia.com/images/cms/file/28544946051.pdfIn PDF document text
    • https://olajpark.hu/files/files/87381589650.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/fukotopijekodadipusotep.pdfIn PDF document text
    • 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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 10892 bytes
SHA-256: ba55580dba77561b6461cc64fa0dea71352643402390c100fc9fe4c13676492c
font_02_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 18688 bytes
SHA-256: 542f197980850d3ae245c0751f805bef86437981149144c46c16326f5abc38d3