Malicious PDF — malware analysis report

Static analysis result for SHA-256 983663202dd7931f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 03:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f826737d7ca5cfdba1b82460ea2e9cd2 SHA-1: d292dbf8e2cf916510f19ae71518c96fb4c622ed SHA-256: 983663202dd7931f20027fe02dbe0bdb2ac0da9ef446bd08ef7559d24cf1ec2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. Heuristics indicate this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence suggest malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://vanchuyenduongsat.vn/upload/files/80870402813.pdf In PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/lixiwesowixero.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609de39c590a1---70324576020.pdfIn PDF document text
    • http://www.polni.si/Images/files/nibabovodovi.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/sizusilipuxixebukasidami.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc041b84e2a---lalubupukazugosipog.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e81ef1f1e13---13807570120.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gpcltst2degts46oc7vk4jo0fi/perebiwowopewutodemufu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7bc9eee9a6141bc7a52190cf2781c3d8/31105710445.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/filotosizo.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/zarilejuwinugazaw.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090706262184162.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/99300274659.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e5ea74893---20916663084.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/miwufedofexud.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pqb8tv6fbadkfkp4gc20fmd8b6/91147462466.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d8e6b69f---tolenotanopavorurizud.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/6161919836.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/93255367484.pdfIn PDF document text
    • https://theipbuzz.com/images/file/12028282343.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/mudez.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf1a2caa2---tojuzifuvaxofetarevi.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/56834672080.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/12528260877.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/80012380463.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f912bf18c912ebe9bba74ef455e44e3f/97799104616.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f4ab82e497240167a9c278ada0b166b/42680729474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=percent+change+worksheets+pdfPDF 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_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 18588 bytes
SHA-256: c11e1d571f9a32bd0ac0449cfb953063a7e3fb378cad568086bef0e984903811
font_01_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 10940 bytes
SHA-256: 2b71f1bf84fc26ba080d97d0f52f554e8630d036daade3a94c1a4c29b6c87440

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