Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00a1bc2c163cb6c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 22:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7e1b00fd0c6d5d105cae209592e3e769 SHA-1: 031093322c89bac41a3069b0a207d3c35166541e SHA-256: e00a1bc2c163cb6c16aa80a660eb5190a9e186bce8e1d8177e6546dbf5c940c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://simbhaolipower.com/images/file/jilatewugesimisaxemim.pdf In PDF document text
    • http://dichvumucin.com/upload/ckupload/files/76310854553.pdfIn PDF document text
    • http://lg-palette.com/upload/files/favorelokezotenax.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/juvazemasavoxod.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/96912202073.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/23142859175.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c2760f0---metafulanimugovito.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/94822345518.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/20581351908.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcabcd91cb---18538136371.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/5922702446.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca8aa2d287d0e018b08767942b895d42/sutovofo.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/moxidogonedizofoguresodu.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/97168396410.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/25116148007.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/59960275270.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161318578954e9---benotazo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bunedunapexukozap.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210908155224.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/85050580394.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/64819794332.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/rasitisukatibevusuta.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/widukijogifetemikadunow.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/petifijub.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/32977499227.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/gozenudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+fire+diamond+top+up+hack+apkPDF 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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10840 bytes
SHA-256: 48740a768b9e70d87b3b1387269d3083a0ea200d345ddc2af1aafcbe35b6bd6b
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 17920 bytes
SHA-256: 4ce4520f24f9ff99e13a3221e54fbd3162197d5fccca1dae4d8d0a470523b92b

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