Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf14f4d9e4159db…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 11:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cb08fd05ed10c49858f6d31f3c14f4d SHA-1: d69b32a87de7c1c9024c996733657dac6d764b65 SHA-256: aaf14f4d9e4159dbfc093076c8a6834bc31862e9440c1bc1e4a222ddf13432d3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and compromised CMS uploads suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=ld+player+latest+version+name PDF link annotation
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/lubalaxutunakimarokolata.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/39431271942.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/23la22aff3d0b16qeg84ahomi5/77214396571.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/11651705557.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614563c785718---25931443258.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/buzubudimujixutipawij.pdfIn PDF document text
    • http://chinalabware.net/d/files/fufin.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dd8c855868f2c17073936377b7e835a7/66158091207.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/xirusoxadutenap.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/96570761137.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8a878de2---40572553764.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cab538b---pugazuzaxigim.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109042253232983.pdfIn PDF document text
    • http://abnicum.ru/files/file/zarogiju.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/pasuzozerazire.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/vevolaxusagapu.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/banaxineruruvoxivaj.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/65377157087.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/5211854895.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pewuvipugokote.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142400284d27---wixugeniwid.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/65637729882.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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 10688 bytes
SHA-256: 711bede59985c64c14cf5f5b2c6da1025ee8924b355ecb920ba3dbb3f6f4c072
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 17000 bytes
SHA-256: ea037dc6b8716bf27df6d085d48b46d2111ebd3856dc817d61cbf00b0337689a
font_02_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1