Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14a5caccdb3d7b8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 01:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2676152568631f92d41de66fe5b9244e SHA-1: f8d2bf0a7ee2c9a8891505d158058c096fc7e1c6 SHA-256: c14a5caccdb3d7b868c32ab6706630d64b696f57d09624dc4b066587ad4f9e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the link farm structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://fuguchair.com/upfolder/e/files/20210919113246.pdf In PDF document text
    • https://tedvandergulik.nl/userimages/file/68778748088.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/bofowoguwadodumexajuje.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/wuxosinume.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea6a13716---20560221194.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/baxosotiseduxipatowa.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jinotoxoxomegonas.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/mutenigajazazezelasexaset.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/27777686214.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/sosinobomoluzitutulezese.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/legowalalowafirafa.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/45518204491.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/53711810218.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2643eaf---koxejo.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/raganigovilomovim.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7a8e681772933bd2388c9a1ca540d928/zawusajusoxazesofetavasij.pdfIn PDF document text
    • http://ymmicro.com/files/files/92822911050.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/xuwoxemazorosu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/geponuzazedojixopewirulim.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/57844506055.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/68009164463.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/17474627287.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/82633415137.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/83002109936.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/tidutusatumibuvux.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/7816860651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=to+kill+a+mockingbird+pdfPDF 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_off0000b7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 10760 bytes
SHA-256: 0933e6c053e10542b051830c0bb1bcd07b5a7e209d25c015b3b94c5983ccaa39
font_01_sfnt_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 15908 bytes
SHA-256: 328961f16aee29b1c99c4dd471f9a752c35006bb6628262e3f67f0876bebfa64
font_02_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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