Malicious PDF — malware analysis report

Static analysis result for SHA-256 946415651fc9f031…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 19:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 256582ef8ce5590e262cd11a139fdd6b SHA-1: f85d08dfaa98209d183cedce5ab6f9216c6a226e SHA-256: 946415651fc9f03170c49103db85cc3a485cdd8f22a6ba72f976e92722e17252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URI links and link farm heuristics suggests the primary goal is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=phone+showing+safe+mode PDF link annotation
    • https://ap-qatar.com/userfiles/files/39569861595.pdfIn PDF document text
    • http://vejwun.cz/images/72119315260.pdfIn PDF document text
    • http://scarpatti.com/files/84643529101.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8f1a610c---wikuwaravapawugetulu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/89683126430.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/sefap.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/vunajefoma.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/netakoxawabagup.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/dudotodaroxugib.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/38041172400.pdfIn PDF document text
    • http://thedreams.cz/files/77115166964.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210909223055.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/89414078190.pdfIn PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/39812031158.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/bemuvezibisegufuxo.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/20340866586.pdfIn PDF document text
    • https://efnnma.org/files/file/56585998943.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/zuvebegunofomepeji.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/9508770440.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb25292710---75901878716.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/85146065809.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/5527819163.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/fupof.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa063cd3ecc6151e10c67c0c94b495ed/20734037077.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/tonezamogefoj.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_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 17804 bytes
SHA-256: c35f6496bb49d791baf225a5f4b2d6358397ffebc564a705cab1db36aca0c134
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 10644 bytes
SHA-256: 9f633f8a6cfcb6a86801002da04eea292f2d31b8e9f4ce8e60f506f4c5488381