Malicious PDF — malware analysis report

Static analysis result for SHA-256 849ee3fd5a5f5498…

MALICIOUS

PDF

83.2 KB Created: 2021-07-06 17:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f564adf42e0af05f3380a4825068ab77 SHA-1: de55c18da914dd1444eba157722394d4098a3189 SHA-256: 849ee3fd5a5f54982988d57760a909fa604f33add296678e468af80f178ba0f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to an exploitation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=list+to+iterable+java PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9k9arl3g2rcnno9its3lb8oos3/56388962381.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609062fe40860---vixibafekebul.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/giseganajebin.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/25703cd500315517f1bf503702dbc711/96439508721.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d19fe32---depazefagupej.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b57916b484c1c4fba3d8f1c1c0bb8358/jigiwexoxofaj.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/99963a51e3d311d05dba3a5f69ca7373/51967855456.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070994d0eece---pipik.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/dinumujivileridededifomip.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/vesorijuwubusafugazazem.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc0b1c53e---mafaxisok.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/28524603326.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fc455e90c87a517d54d647bfdd490d71/kuzugur.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160948e68cbb83---lonaranukamokomusij.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/vijexelusevuxomut.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7da0a228a1c78c6dfd7783f2ab109860/1936651583.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/11511505307.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4213c96f0---jemolomo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b90da80203231f5509446cd8b9e3dc7d/51158292323.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe16e02ff---xitekekatenabotufozi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/79907e491362c4af757c354cad848ef8/wujato.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/71698039994.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/51911551584.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pifomekemumanofojuf.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/92370858576.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 10292 bytes
SHA-256: 5b20708b33ea74d931ff10e8ed6a1128fb7f7ebb9a827e2c9ec006d93221fcff
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 17188 bytes
SHA-256: 0fa39941d64a6b1aff35a5245c91ff8ec737e5b8df2aa474d9f64233db55c84a