Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f52dfb0a1db722…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 05:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dfc9664dd7ffa4c1e8e19df7e7aa467 SHA-1: 48297c12f33bfc7696d391d6d066aa926d7c973d SHA-256: 53f52dfb0a1db722fd825d79857a61686da442f8571afc781d515fd2fcaef1d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jagamimpi.info/contents/files/70384051862.pdf In PDF document text
    • http://sbairs.com/datas/files/54026287512.pdfIn PDF document text
    • https://masukpt1.com/contents/files/43150484165.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/73079795229.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/75126409295.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/6978109189.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/buvapozu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395e3743c70---kusigixarukuxevu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161310211348f1---luzodepugikisufolenuniwa.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f004915737---25237248548.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/46141451909.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tumesabisolukodovexazar.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134219445479---24128346518.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/73666093117.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/65973769123.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/69378827595.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/4851426145.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/gupijawaze.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/32490908967.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gesatolonizaduzarebuvaza.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/davolunefavejot.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/mewuwiwedasajexom.pdfIn PDF document text
    • http://1carl.com/userfiles/file/remebowaru.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/11146874553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+screenshot+on+android+11PDF 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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10764 bytes
SHA-256: 7a2d55b963704b2fd583cafbc64a8a2a5a1a899dc6552200004c1b92dcff4966
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 21076 bytes
SHA-256: 294f555e76bed8d9e6a43d00966a9cc10896e21f6586de3844c4f059448281eb
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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