Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a3547890831748…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 22:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bce0c5c024f1bc35afc37535dd866e47 SHA-1: 784442e8502bd113fafd3919f9eb540a42ba5914 SHA-256: c3a3547890831748161aff299f144fd24b8d7ffdc042316c5c4e046dcbb2275e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://anukulagrotech.com/ci/userfiles/files/32859180195.pdf In PDF document text
    • http://chuaphucluong.com/uploads/image/files/36399848706.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfc44a5a9---14841871495.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/55713557011.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/kiganowasajajalinazexotis.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dabezumebofakelixetubej.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/96306999953.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/45376761246.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/383109760.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/xizesokedifurebapikevud.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb9074666---dejeko.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/93183972873.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/48225462788.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/wapoxagufokajupa.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/rikebilesujus.pdfIn PDF document text
    • https://kildevangen.dk/files/tegiludojenizewadesi.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/34998975552.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410813407ce---ruxabogurepujugatuxidup.pdfIn PDF document text
    • http://yanartextil.com/firma/files/91495023824.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikirubavex.pdfIn PDF document text
    • http://ailizia.com/userfiles/bakafefo.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090823060073499.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/95056085628.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lofaralofunogojene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+walking+dead+season+10+episode+18+putlockerPDF 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_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 11416 bytes
SHA-256: 4de8e340fe6da0079f25ad663635accb797919390fb9d39b53746fbb100cbe99
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 17740 bytes
SHA-256: 3ae590bb8daf437dad3b6239f25636afa8a50b835fd322bb61f7ce4b6ed90537
font_02_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1