Malicious PDF — malware analysis report

Static analysis result for SHA-256 9847e3eb415f2ecd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 08:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f7d53a46497d77c14ed90ffcc27e892 SHA-1: 26aaffbbcc41908465e7774d303db09ad7995837 SHA-256: 9847e3eb415f2ecdbc4a02574d0d1cd53fc4e0985d3f45f834905ed5a3ecf375
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of these links suggests the document's primary purpose is to facilitate initial access via spearphishing, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7gnvf88cu09q0q1udtvs3avof6/90216917283.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878661da6f9---sofuzotiwusemoriwiwa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608700da9941b---mititirefidasotojer.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/902f7dd099301e3029b283c89b8e790e/timokirum.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfb9f527f6---60221959766.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc36e1b437---padalapapakixu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864926b32fb---16049673127.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/pikenitodoweva.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pikoxuwefovake.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/48807791491.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/bukidiwi.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/wabolos.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a05615f0a26---80190800857.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/65425613387.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bonaludogivase.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/wiwusibiwurudolekos.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88b3c0f48---xesakewomusakafo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14772b4c5d---vijevataluwuw.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/japome.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/topapupipibofewuzamuwadi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5a6a840c8653194badbb6e4ab3e39fb0/wojakefaxofowuvorukekiza.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/33812089892.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/masom.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710082ddf0a---98332756083.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/razokumera.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096040342a51---91240969009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tableau+de+la+conjugaison+fran%C3%A7aise+pdfPDF 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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 20392 bytes
SHA-256: 2c144e7c0cfa5975b4805102c8156c633e20fcccfc871ae668db92378f304539
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 11228 bytes
SHA-256: 1d184d3bbae75d71361323030f2844eced96c9034f8cffa990acd8f46c1d1d23
font_02_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1