Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b5e77fbf05954…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 05:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0c2c48cae050b9d07236a5d6fb508c8 SHA-1: 371cf1bef85ad85fe77c741e208163c2be9b8f0d SHA-256: 815b5e77fbf0595470316f50196f7af6b906ae2a616cd452bfed9c31e5728e61
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=phone+usage+tracker+android PDF link annotation
    • http://tienphat.vn/imagesflashupload/file/2665856291.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/nuxafexuredizopix.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/86867761145.pdfIn PDF document text
    • http://www.agot.pl/upload/file/34318396750.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/79753160722.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f256504c---80839050039.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdff8a1ad8---jobarasumesis.pdfIn PDF document text
    • https://dalba.net/other_files/File/mejizararom.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/fasixubex.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/lemoduzirutudaj.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/wofovabujob.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3d683e4e---24936472987.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/43947097609.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sovesezojak.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/gegexozedemidutu.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/28912726888.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/22106372929.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gerisebeg.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4fb7ed2ac---fukuxudowawarituwe.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/lutaxajumu.pdfIn PDF document text
    • http://kelsenator.com/userimages/9033917950.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 17620 bytes
SHA-256: f481220ad7aa4362d1bee3a4584ca58b92a5d4ea84ebf05189d7c5565a970f26
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10796 bytes
SHA-256: 8a14f457d71f585b237686d1bba343eb13cdc5ada396433811dd973b97db79fa