Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daaceb43558cef2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 09:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9fccd1cc68c9805968e60a6228c99b2 SHA-1: 6b0f5a200214a3cd7e277510b0da8fd298da9b13 SHA-256: 1daaceb43558cef21f6646cbfb24997c97388c441e32bfb55aa49df237546b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hoangle.vn/uploads/userfiles/file/11340145487.pdf In PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/73199827327.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/97588913096.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/babaxijirigupezabigizap.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161324895d63ae---xometoxiwutowupujena.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/18633424108.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021951256445281.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136c48e5d995---55924721226.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/83910856026.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/jowul.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/geroguwuzulikugeludetusu.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/41477428841.pdfIn PDF document text
    • https://tipresentoio.it/images/file/36504266417.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/64386673719.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/94397588463.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/3973860252.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/91800504273.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/eda451143f3e254520af6b6adfad6236/77126339798.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/dokebekuketebemazexibanep.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/86791456822.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4627608bf26553d1e4c4dd9a8d361582/tezatosipusuweradaxibofa.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/bolefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=label+parts+of+the+endocrine+systemPDF 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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 11096 bytes
SHA-256: f1405ffacb34841cf3ef93f33b947c43d2e54ceb046b0027ce5d14089beef844
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 17280 bytes
SHA-256: 10dc29455e93886736e81b9c07c9d9cda16c8388b01a008f467edf02f256c34d