Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a30609e28c5a9fa…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 20:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d6cfa385d40021c83b616d1c1780284 SHA-1: 7197da0e885b637010c104db4110c79454a3dfdb SHA-256: 8a30609e28c5a9fa8b3497fda68c5b74aaac39421fe7009713892657caaa1d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://huntic.ru/uplcv?utm_term=list+of+basic+sql+queries+pdf PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b06b31a0---ganovevupinoti.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-28/20210728113359827475.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/59529642796.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/jupepudodosivozugeriraxij.pdfIn PDF document text
    • http://markone-tools.com/upload/files/puvixivapajizuserodepowi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf931b205---pakexafupejub.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/46367649788.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/zabaroritogunipuvaxanit.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/32863899576.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rivorusidolexigofetopow.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105161341.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/viloriwokere.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83443232006.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202108151441414757.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/82705725531.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6eeb77e73a919a01ef8526f501e8bc3b/lumovenigadetarelitabe.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7d6ef18b---20513092370.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112baf8c9031---xotojolekuraxu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vobqjbhd7t67ou7shh6bm4g3h3/zemeviwakabokukivanagepop.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/47653160972.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92adcfa1---82985089764.pdfIn PDF document text
    • https://polandpools.com/contents//files/tuzorilawizumerumoraxuf.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/295131dd356668fadb9c838920e086e1/sinodunobumitidepa.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/bukobewadub.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/kusutibapup.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f85cd073b31---tufufekekozu.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/reruwebugevix.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 10852 bytes
SHA-256: 6a56fbb166494cd7834c2dcd5af74dd1e1aab571434a24bd55f69cbb99a26dd0
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 18552 bytes
SHA-256: ccbeb298443ccf59de86cb776b7793c7644b4aed539e1c4d7cde0ec9b60ed6e0
font_02_sfnt_off00013bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1