Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a441c89dbf649a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 15:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5da12583d224ad73d57ab34a3890608 SHA-1: 4511932611c46eb316f0a62cac016e37e83e170a SHA-256: e7a441c89dbf649aadc9ae141206afc18fcb6eba9b283c0eb3128fc68ea47a9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ks36cv0r5tbcvjt09i0pmltoai/13950506481.pdf In PDF document text
    • http://thepokewave.com/uploads/files/97740221417.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dpbf0lujpqrvsop8omjc3tt1k4/45390467586.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kizudotinosovaredi.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/puwujipolikavanor.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c9f64437069a8d989d91c596528b8afc/70235815846.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bea771683---kabezudujixozofut.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/3629282657.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/14471319299.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16241034659144.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/f293tbne8rou75mcnn45h9pr97/resukezabakawumesulem.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/23489704321.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/8at0gstgkvqj4tld85sl3gmtut/25445351071.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/worojawajokedagogob.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fbceumm0lfdeb9gjdcvm900oqt/86579076177.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/22546683707.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f1aee829---jatixirexenopu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7c5b63e1340dccdc3f5db030909896be/52474547928.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/98494408877.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/wuvaxejewug.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/21232252229.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850cb88253---sevigawuxufef.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f1f9fa35c16cc7e03e0d5ae42fc8da73/14897074210.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cda21092845868793598978e5f3335eb/gukaxabovop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=charitable+trust+deed+sample+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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 10808 bytes
SHA-256: e1e0f1d98d003de1cbc101322702d083f91f527d107cdf6f0cab9e07be147abd
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16804 bytes
SHA-256: 7291b877c3468b5664128b4ef943d9e81a6c19a2a0fb1bfb3f84a6ebc3f71619
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1