Malicious PDF — malware analysis report

Static analysis result for SHA-256 1098feba4d9e3d97…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 22:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 321baf825a53abad9b9e217de95e1be9 SHA-1: e4b927ffd47548f6144a38cd2917c46d10ce2573 SHA-256: 1098feba4d9e3d974be4a2947a377646a25895ca46a40f44123c9793841318aa
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to host and distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of download-related heuristics further supports a malicious intent. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://juncheng.tw/upload/files/jokofafutofabeximude.pdf In PDF document text
    • https://towa-aaa.jp/userfiles/file/fenatuzi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/5335162638.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/sugigaxoniwixobenemuvi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574a68015c---85972310577.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/72318344651.pdfIn PDF document text
    • https://beltamas.by/content/Files/pimovitato.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/42381555719.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/fonokimetudijubakaja.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/93927814752.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/xorupisakenolimoga.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/58107349183.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kugodop.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozijikobugapoxejimep.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e453ca72cf0accb30501f585c161c2ca/96249281719.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405545c0ff---40132606822.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334c284cefc---lemazulirotol.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gizon.pdfIn PDF document text
    • http://jngf.cn/files/file/21794934245.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vizufanigirovuwep.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/15062429394.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/zokewepal.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/wawofejerodib.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/27230978914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+movies+app+apkPDF 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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 18324 bytes
SHA-256: 9cd9ca95646554effd6aa8dd36f9d9cfe34a56b7d6d6815dec9e1b8f5a3d0b91
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 10600 bytes
SHA-256: 26143dfb59f45f6ca7a8f847fb7fbab6c120ad93be6c09a1401425f3a2f8fe66
font_02_sfnt_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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