Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d43dd023503592…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 05:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 304624af2b0ee6ced28f1c1a68e3f61c SHA-1: 177c1d4399e095608dcb4787a8a5da005d65b925 SHA-256: 51d43dd023503592f76d9eb9055e4f35b16359cf5f84a76aaf25f26230d9d896
184 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a ML classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a phone number for fraudulent purposes. Embedded JavaScript streams are present, suggesting the potential for downloading and executing further malicious content, aligning with common phishing and trojan delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b048f01f4e---sovomimoposomexefakodera.pdf In PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/misefikezusifuxo.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jupigupobi.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fubireti.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/79353755547.pdfIn PDF document text
    • http://ingore.cn/upload/files/jexuzatepovaxitujaxegul.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/fitikevavojelopuro.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5d72947e---12829571798.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/35790532426.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/ramopevanarun.pdfIn PDF document text
    • http://dhf-china.com/d/files/kixirabebusewira.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/40867223489.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/85280980900.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/53742766409.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f71d7ea93---97426121614.pdfIn PDF document text
    • http://ewtch.com/upload/files/bisikunovurezesomuz.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/99361006626.pdfIn PDF document text
    • http://bankerz.in/qpic/files/kosav.pdfIn PDF document text
    • https://sadex.pl/fck/file/69903462588.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/retumore.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/delixanudipuranepopasa.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210906181102.pdfIn PDF document text
    • http://fourfoods.com/images/files/40077741969.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/didolatulam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pixel+4a+bugPDF 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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 10116 bytes
SHA-256: 20e43e1d5d60d643988ab874c4ad36e3aa7d7de68941aadb97d9f62bdc1a5d02
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 17852 bytes
SHA-256: f712a8eea523d38cdd28a40fccdd6b76d794a6628c4cf2998af67d996eebb10a

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