Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e92962d104a109…

MALICIOUS

PDF

68.7 KB Created: 2021-09-05 04:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cb89901a67e298855856e8ab348e896 SHA-1: 266a6539b3b31391cdc30d7e7f7bf4219da10dd8 SHA-256: 63e92962d104a1092fe335808401d4b5d31023bb8c2d2c5b4ebb4bc9354bffe9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The heuristic firings related to link farms and compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://futuresbuilder.net/dayafter/uploadimages/newsimages/file/jabizunav.pdf In PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/17798055995.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/97351576748.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/10625737370.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gigoboji.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021081602483273499.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/84165717784.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wenuzipijetumubenid.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/64989043195.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/846312483.pdfIn PDF document text
    • http://vce34.ru/attachments/file/pivelemezawiretigizuw.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93788783493.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/bakilotoson.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83ab59040---10401978170.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/75911762660.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/sibamariniseponutup.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/muzejadisetobimemow.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/566f94aeb6829c5e19fc2595895ddf62/liborefepixax.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a44c58973---45163439307.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6c2f4e6ae13ffcddfb15c1e6113c99f/kavatibubokok.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/zogonotovudoloj.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8c2339e0b444eab92fe4f749df1ff165/88510796111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=electrolux+blast+freezer+manualPDF 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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 10792 bytes
SHA-256: 9ec374e77b89f3f5c92ebe03cb7cfc8b5bda18d2da4a65863ef25b07b497240c
font_02_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 15036 bytes
SHA-256: 56c4aaa9fed16891142072e879bbc4770a461c670ecc8efa8460238f669480e3

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