Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93dd4eaca59c148…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 15:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 754004ae3547d59b145fdace595fbaa8 SHA-1: 7d2681fb471af95d98ffe06ad3a06e935148b140 SHA-256: a93dd4eaca59c148f6d2909ab6644201f02717b7b9e44b398b8dbcc807d6d830
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or SEO poisoning campaign. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://studioambienteterritorio.it/userfiles/files/lomatevixurowugutedo.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/jobekimejutapos.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/243d7dd0bb67beddc2e1816feb3dd4bb/najuvadokuzokoravireji.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/wojowatalefogiwibezudel.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/77344117590.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/94482372217.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/36944866338.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/66416367975.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/53677438713.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/50169272257.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/42786704793.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/bowukolad.pdfIn PDF document text
    • http://cx-gl.hu/images/files/39971883105.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/90841150576.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/kobagefavubef.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d4499596679ab4f87b3353c5d83211b1/28201371064.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/88454764711.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/bajune.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/78611498598.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/wewifowunejajiwad.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a178a1f5b1---voduzitalogu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/62560452904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+language+from+arabic+to+english+in+androidPDF 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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 11240 bytes
SHA-256: 1e375acb89ece5697209941c1c87b3f76bba170ee6be9f1123513991b2945bb4
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 17948 bytes
SHA-256: 88c46651ff97125fe506dafdf93c114084393a66181e54ff4758965c31d21b4b

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