Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa2731ea32f1d1f…

MALICIOUS

PDF

95.7 KB Created: 2021-09-02 05:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d6c5a1c29b21c01466446c4a75d2ef7 SHA-1: 399bd946492b3d9c2508d2bef5d781641cab4d42 SHA-256: eaa2731ea32f1d1f96657415f77cd131dc76e25fc290e77204850386338d5023
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://niboparis.com/upload/fckeditor/file/1628005745_1.pdf In PDF document text
    • https://debcopharma.com/userfiles/file/lanaxokitawu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ef2giv0pjbp0uftqno9lf6lms6/536600259.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9817962d---35743571954.pdfIn PDF document text
    • http://someteme.com/archivos/_20210816103117.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/97102647486.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/16020252454.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/29206932276.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/33321408751.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/40487551288.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5dso8com1rj77jrctgrfeg13s1/78806995081.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/suxekapexevopezivo.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/37643920565.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/19235113500.pdfIn PDF document text
    • https://amblamy.ee/upload/file/11590424579.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/78a2631f2d6e2db3dcca35643a1126c9/25662303735.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21a96b8ba---52991342342.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mesagejidugepixikorigu.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/besogafazimatasajokinas.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rakororikemaxigezixolaz.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/64037588817.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d10d5980d96a7ca872fa601f39c813da/femelosuzuxitoxide.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/taluvoxinewezawezufi.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/4281635651.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7pc43qac9dp7m09k1dv3c0lfi4/xozanafovogariruj.pdfIn PDF document text
    • https://cooperspick.com/files/26954927433.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/32132403298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=porter%27s+three+competitive+strategiesPDF 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_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 18100 bytes
SHA-256: 6438ce6b2ac2858728fd5b3ea910eaa078f70c51532ffb72edf9d040b376daf1
font_01_sfnt_off00013faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 10772 bytes
SHA-256: 791c1059a7461bcb22ac589677ba7f0e6270609a4e6e451cb37a2e78bdb8dd04
font_02_sfnt_off000158a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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