Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf43baf23463d88…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 17:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67da6ec02c684c44296d356b494d2254 SHA-1: a24fc0268f546680f02897d19e319cf96a702557 SHA-256: 4bf43baf23463d889c0a932516ea943a274f85569c3c9a8a659338e3cc3e6d5e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the 'Callback phishing phone lure' heuristic further support a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=zombie+infection+java+game PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145623873055---xaponutulurax.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/rasuvobejijurodeg.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/bodufu.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/vedafipewomatewepokapok.pdfIn PDF document text
    • http://rotang.net/userfiles/file/54055645081.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905030600.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/15833411845.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/gitegodozuranujubikuwu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133e09059f63---dunezunemotevewux.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/53777141677.pdfIn PDF document text
    • http://birdwatching.sk/media/file/mevivedixutixogutu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c354d876---kofazidev.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zelize.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/fugofizesazudow.pdfIn PDF document text
    • http://flirdining.com/uploads/files/guretugimoderawalaririzu.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/61423376140.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/60954099620.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gikupan.pdfIn PDF document text
    • http://tochuchoinghi.org/files/83928267496.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tivowonaros.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/numepakukukibowip.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210909212425.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kexijawivorutexuwuto.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10664 bytes
SHA-256: 2341f55184d7d2a01af7c8346077a59c33d096d4f07cb0f1ae847f3dc9ab954b
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 18320 bytes
SHA-256: e37108c78be69e359de389e4d60bb3c4fdf574adad66b812a940990f7ed3edc1

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