Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c3e7c58db62c41…

MALICIOUS

PDF

82.7 KB Created: 2021-08-30 12:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04af7260e0db7911c83e2e9d3d096559 SHA-1: d7c96a6ee0e1fc32dc39457ba0771d3ee88c2b61 SHA-256: 41c3e7c58db62c414695a08cb687b9fbcb0523b74d1c50a085d7907629170701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c251c2fd41c3e7e1dbbd0edd2d5a9b5/sajilujogukuwake.pdf In PDF document text
    • http://jinanxintiandi.com/userfiles/files/jifotasitujufifal.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/lulodawirav.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc43ddf731---serajagunudepolusenotebu.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/83343494475.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9d9b585e---56759705607.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b461ee00a9---5943942749.pdfIn PDF document text
    • http://sbairs.com/datas/files/lubinesurigeletomubup.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/042151344575.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/zokumaxutiganurerato.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a83ea981---84973243772.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/13209508517.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607364e000570---34206141144.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0bf6eefe---46249205610.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/06f7506b8acb2c9e143db0fbc89e2c4f/rimut.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/kukagokob.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/viwivugunubifurodonoji.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t2n1p84nvjafsb5voocr2l8vsl/99449468512.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/74198565081.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s0uc28nmcv3quh2e6tbm1jt10o/revulizuja.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051353753_559077538.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160795ef1e0e8c---50529533467.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/99719638594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+tell+tale+heart+freePDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 17808 bytes
SHA-256: e83e1c994d53c070a83303b6dd3b6d874c4dcd2150bde26bdb4450fac2df50a5
font_02_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 9792 bytes
SHA-256: 9b0dcbb302cb411abc01c2c39f0ec113fd9831c8818bea28059d33573a25bfb3

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